RIG-VEDA-SANHITA. A Collection of Ancient Hindu Hymns. Constituting the 1st to the 8th Ashtakas, or Books of the Rig-Veda; the oldest authority for the Religious and Social Institutions of the Hindus. Translated from the Original Sanskrit. By the late H. H. Wilson, M. A., F.R.S., &c., &c.

Vol. I.

Vol. II.
Vol. III.

8vo, pp. lii. and 348, cloth. 21s.

8vo, pp. xxx. and 346, cloth. 1854. 21s.
8vo, pp. xxiv. and 525, cloth. 1857. 21s.

Vol. IV. Edited by E. B. Cowell, M.A. 8vo, pp. 214, cloth. 1866. 14s.
Vols. V. and VI. in the Press.

RILEY.-MEDIEVAL CHRONICLES OF THE CITY OF LONDON. Chronicles of the Mayors
and Sheriffs of London, and the Events which happened in their Days, from the
Year A.D. 1188 to A.D. 1274. Translated from the original Latin of the "Liber
de Antiquis Legibus" (published by the Camden Society), in the possession of the
Corporation of the City of London; attributed to Arnold Fitz-Thedmar, Alder-
man of London in the Reign of Henry III.-Chronicles of London, and of the
Marvels therein, between the Years 44 Henry III., A.D. 1260, and 17 Edward III.,
A.D. 1343. Translated from the original Anglo-Norman of the "Croniques de
London," preserved in the Cottonian Collection (Cleopatra A. iv.) in the British
Museum. Translated, with copious Notes and Appendices, by Henry Thomas
Riley, M.A., Clare Hall, Cambridge, Barrister-at-Law. 4to, pp. xii. and 319, cloth.
1863. 12s.
RIOLA.-HOW TO LEARN RUSSIAN: a Manual for Students of Russian, based upon
the Ollendorffian System of Teaching Languages, and adapted for Self-Instruc-
tion. By Henry Riola, Teacher of the Russian Language. With a Preface by
W.R.S. Ralston, M. A. Second Edition. Crown 8vo, pp. 576, cloth. 1883. 12s.
KEY to the above. Crown 8vo, pp. 126, cloth. 1878. 5s.

RIOLA.-A GRADUATED RUSSIAN READER, with a Vocabulary of all the Russian Words contained in it. By Henry Riola, Author of "How to Learn Russian.” Crown 8vo, pp. viii. and 314, cloth. 1879. 10s. 6d.

RIPLEY.-SACRED RHETORIC; or, Composition and Delivery of Sermons. By Henry I. Ripley. 12mo, pp. 234, cloth. 1858. 2s. 6d.

ROCHE.-A FRENCH GRAMMAR, for the use of English Students, adopted for the
Public Schools by the Imperial Council of Public Instruction. By A. Roche.
Crown 8vo, pp. xii. and 176, cloth. 1869. 3s.

ROCHE. PROSE AND POETRY. Select Pieces from the best English Authors, for
Reading, Composition, and Translation. By A. Roche. Second Edition. Fcap.
8vo, pp. viii. and 226, cloth. 1872. 2s. 6d.
ROCKHILL.-UDANAVARGA.

See Trübner's Oriental Series.

ROCKHILL.-THE LIFE OF THE BUDDHA. See Trübner's Oriental Series.

RODD. THE BIRDS OF CORNWALL AND THE SCILLY ISLANDS. By the late Edward Hearle Rodd. Edited, with an Introduction, Appendix, and Memoir, by J. E. Harting. 8vo, pp. lvi. and 320, with Portrait and Map, cloth. 1880. 14s. ROGERS. THE WAVERLEY DICTIONARY: An Alphabetical Arrangement of all the Characters in Sir Walter Scott's Waverley Novels, with a Descriptive Analysis of each Character, and Illustrative Selections from the Text. By May Rogers. 12mo, pp. 358, cloth. 1879. 10s.

ROSING.-ENGLISH-DANISH DICTIONARY. By S. Rosing. Crown 8vo, pp. x. and 722, cloth. 8s. 6d.

ROSS.-ALPHABETICAL MANUAL OF BLOWPIPE ANALYSIS; showing all known Methods, Old and New. By Lieut.-Colonel W. A. Ross, late R. A., Member of the German Chemical Society (Author of "Pyrology, or Fire Chemistry ”). Crown 8vo, pp. xii. and 148, cloth. 1880. 5s.

ROSS.-PYROLOGY, OR FIRE CHEMISTRY; a Science interesting to the General Philo. sopher, and an Art of infinite importance to the Chemist, Metallurgist, Engineer, &c., &c. By W. A. Ross, lately a Major in the Royal Artillery. Small 4to, pp. xxviii. and 346, cloth. 1875. 36s.

ROSS.-CELEBRITIES OF THE YORKSHIRE WOLDS. By Frederick Ross, Fellow of the Royal Historical Society. 12mo, pp. 202, cloth. 1878. 4s.

ROSS. THE EARLY HISTORY OF LAND HOLDING AMONG THE GERMANS. By Denman W. Ross, Ph.D. 8vo, pp. viii. and 274, cloth. 1883. 12s.

ROSS.-COREAN PRIMER: being Lessons in Corean on all Ordinary Subjects. Transliterated on the principles of the "Mandarin Primer," by the same author. By Rev. John Ross, Newchwang. 8vo, pp. 90, wrapper. 1877. 10s.

ROSS.-HONOUR OR SHAME? By R. S. Ross. 8vo, pp. 183. 1878. Cloth. 3s. 6d. ; paper, 2s. 6d.

ROSS.--REMOVAL OF THE INDIAN TROOPS TO MALTA. By R. S. Ross. 8vo, pp. 77, paper. 1878. 1s. 6d. ROSS. THE MONK OF ST. GALL. A Dramatic Adaptation of Scheffel's "Ekkehard." By R. S. Ross. Crown 8vo, pp. xii. and 218. 1879. 5s. ROSS.-ARIADNE IN NAXOS. By R. S. Ross. Square 16mo, pp. 200, cloth. 1882. 5s. ROTH. THE ANIMAL PARASITES OF THE SUGAR CANE. By H. Ling Roth, late Hon. Sec. to the Mackay Planters' Association. Demy 8vo, pp. 16, wrapper. 1885. 1s. ROTH.-NOTES ON CONTINENTAL IRRIGATION. By H. L. Roth. Demy 8vo, pp. 40, with 8 Plates, cloth. 1882. 5s.

ROUGH NOTES OF JOURNEYS made in the years 1868-1873 in Syria, down the Tigris, India, Kashmir, Ceylon, Japan, Mongolia, Siberia, the United States, the Sandwich Islands, and Australasia. Demy 8vo, pp. 624, cloth. 1875. 14s. ROUSTAING. THE FOUR GOSPELS EXPLAINED BY THEIR WRITERS. With an Appendix on the Ten Commandments. Edited by J. B. Roustaing. Translated by W. E. Kirby. 3 vols. crown 8vo, pp. 440-456-304, cloth. 1881. 15s. ROUTLEDGE.-ENGLISH RULE AND NATIVE OPINION IN INDIA. From Notes taken in 1870-74. By James Routledge. 8vo, pp. x. and 338, cloth. 1878. 10s. 6d. ROWE. AN ENGLISHMAN'S VIEWS ON QUESTIONS OF THE DAY IN VICTORIA. By C. J. Rowe, M.A. Crown 8vo, pp. 122, cloth. 1882. 4s.

ROWLEY. ORNITHOLOGICAL MISCELLANY. By George Dawson Rowley, M.A., F.Z.S. Vol. I. Part 1, 15s.-Part 2, 20s.-Part 3, 15s.-Part 4, 20s.

Vol. II. Part 5, 20s.-Part 6, 20s.-Part 7, 10s. 6d.-Part 8, 10s. 6d.-Part 9, 10s. 6d. -Part 10, 10s. 6d.

Vol. III. Part 11, 10s. 6d.-Part 12, 10s. 6d.-Part 13, 10s. 6d.-Part 14, 20s. ROYAL SOCIETY OF LONDON (THE).-CATALOGUE OF SCIENTIFIC PAPERS (18001863), Compiled and Published by the Royal Society of London. Demy 4to, cloth, per vol. £1; in half-morocco, £1, 8s. Vol. I. (1867), A to Cluzel. pp. lxxix. and 960; Vol. II. (1868), Coaklay-Graydon. pp. iv. and 1012; Vol. III. (1869), Greatheed-Leze. pp. v. and 1002; Vol. IV. (1870), L'Héritier de Brutille-Pozzetti. pp. iv. and 1006; Vol. V. (1871), Praag-Tizzani. pp. iv. and 1000; Vol. VI. (1872), Tkalec-Zylius, Anonymous and Additions. pp. xi. and 763. Continuation of above (1864-1873); Vol. VII. (1877), A to Hyrtl. pp. xxxi. and 1047; Vol. VIII. (1879), Ibañez-Zwicky. pp. 1310. A List of the Publications of the Royal Society (Separate Papers from the Philosophical Transactions), on application.

RUNDALL.-A SHORT AND EASY WAY TO WRITE ENGLISH AS SPOKEN. Méthode Rapide et Facile d'Ecrire le Français comme on le Parle. Kurze und Leichte Weise Deutsch zu Schreiben wie man es Spricht. By J. B. Rundall, Certificated Member of the London Shorthand Writers' Association. 6d. each.

RUSSELL. THE WAVE OF TRANSLATION IN THE OCEANS OF WATER, AIR, AND ETHER. By John Scott Russell, M. A., F.R.S.S. L. and E. Demy 8vo, pp. 318, with 10 Diagrams, cloth. 1885. 12s. 6d.

RUTHERFORD.—THE AUTOBIOGRAPHY OF MARK RUTHERFORD, Dissenting Minister. Edited by his friend, Reuben Shapcott. Crown 8vo, pp. xii. and 180, boards. 1881. 5s.

RUTHERFORD.-MARK RUTHERFORD'S DELIVERANCE: Being the Second Part of his Autobiography. Edited by his friend, Reuben Shapcott. Crown 8vo, pp. viii. and 210, boards. 1885. 5s.

RUTTER.-See BUNYAN.

SÂMAVIDHANABRÂHMANA (THE) (being the Third Brahmana) of the Sâma Veda. Edited, together with the Commentary of Sâyana, an English Translation, Introduction, and Index of Words, by A. C. Burnell. Vol. I. Text and Commentary, with Introduction. Demy 8vo, pp. xxxviii. and 104, cloth. 1873. 12s. 6d. SAMUELSON. HISTORY OF DRINK. A Review, Social, Scientific, and Political. By James Samuelson, of the Middle Temple, Barrister-at-Law. Second Edition. 8vo, pp. xxviii. and 288, cloth. 1880. 6s.

SAND. MOLIÈRE. A Drama in Prose. By George Sand. Edited, with Notes, by
Th. Karcher, LL.B. 12mo, pp. xx. and 170, cloth. 1868. 3s. 6d.
SARTORIUS.-MEXICO. Landscapes and Popular Sketches. By C. Sartorius.
Edited by Dr. Gaspey. With Engravings, from Sketches by M. Rugendas. 4to,
pp. vi. and 202, cloth gilt. 1859. 18s.

SATOW.-AN ENGLISH JAPANESE DICTIONARY OF THE SPOKEN LANGUAGE. By
Ernest Mason Satow, Japanese Secretary to H.M. Legation at Yedo, and Ishibashi
Masakata of the Imperial Japanese Foreign Office. Second Edition. Imperial
32mo, pp. xv. and 416, cloth. 1879. 12s. 6d.

SAVAGE. THE MORALS OF EVOLUTION. By M. J. Savage, Author of "The Religion of Evolution," &c. Crown 8vo, pp. 192, cloth. 1880. 5s.

SAVAGE. BELIEF IN GOD; an Examination of some Fundamental Theistic Problems. By M. J. Savage. To which is added an Address on the Intellectual Basis of Faith. By W. H. Savage. 8vo, pp. 176, cloth. 1881. 5s.

SAVAGE. BELIEFS ABOUT MAN. By M. J. Savage. Crown 8vo, pp. 130, cloth. 1882. 5s.

SAYCE-AN ASSYRIAN GRAMMAR for Comparative Purposes. By A. H. Sayce, M.A., Fellow and Tutor of Queen's College, Oxford. Crown 8vo, pp. xvi. and 188, cloth.

1885.

SAYCE. THE PRINCIPLES OF COMPARATIVE PHILOLOGY. By A. H. Sayce, M.A. Third, Revised, and Enlarged Edition.. Crown 8vo, pp. xlviii.-422, cloth. 1885. 10s. 6d.

SCHAIBLE. AN ESSAY ON THE SYSTEMATIC TRAINING OF THE BODY. By C. H. Schaible, M.D., &c., &c. A Memorial Essay, Published on the occasion of the first Centenary Festival of Frederick L. Jahn, with an Etching by H. Herkomer. Crown 8vo, pp. xviii. and 124, cloth. 1878. 5s.

SCHEFFEL.-MOUNTAIN PSALMS. By J. V. von Scheffel. Translated by Mrs. F. Brunnow. Fcap., pp. 62, with 6 Plates after designs by A. Von Werner. Parchment. 1882. 3s. 6d.

SCHILLER.-THE BRIDE OF MESSINA. Translated from the German of Schiller in English Verse. By Emily Allfrey. Crown 8vo, pp. viii. and 110, cloth. 1876. 2s. SCHLAGINTWEIT.-BUDDHISM IN TIBET: Illustrated by Literary Documents and Objects of Religious Worship. By Emil Schlagintweit, LL.D. With a folio Atlas of 20 Plates, and 20 Tables of Native Print in the Text. Roy. 8vo, pp. xxiv. and 404. 1863. £2, 2s.

SCHLAU, SCHLAUER, AM SCHLÄUESTEN.—Facsimile of a Manuscript supposed to have been found in an Egyptian Tomb by the English Soldiers. Royal 8vo, in ragged canvas covers, with string binding, and dilapidated edges (? just as discovered). 1884. 6s.

SCHLEICHER.-A COMPENDIUM OF THE COMPARATIVE GRAMMAR OF THE INDO-
EUROPEAN, SANSKRIT, GREEK, AND LATIN LANGUAGES. By August Schleicher,
Translated from the Third German Edition, by Herbert Bendall, B.A., Chr.
Coll., Camb. 8vo. Part I., Phonology. Pp. 184, cloth. 1874. 7s. 6d. Part II.,
Morphology. Pp. viii. and 104, cloth. 1877. 6s.
SCHOPENHAUER. THE WORLD AS WILL AND IDEA. By Arthur Schopenhauer.
Translated from the German by R. B. HALDANE, M.A., and J. KEMP, M.A.
Vol. I., containing Four Books. Post 8vo, pp. xxxii.-532, cloth. 1883. 18s.
SCHULTZ.-UNIVERSAL DOLLAR TABLES (Complete United States). Covering all
Exchanges between the United States and Great Britain, France, Belgium,
Switzerland, Italy, Spain, and Germany. By C. W. H. Schultz. 8vo, cloth.
1874. 15s.

SCHULTZ.-UNIVERSAL INTEREST AND GENERAL PERCENTAGE TABLES. On the Decimal System. With a Treatise on the Currency of the World, and numerous examples for Self-Instruction. By C. W. H. Schultz. 8vo, cloth. 1874. 10s. 6d. SCHULTZ.-ENGLISH GERMAN EXCHANGE TABLES. By C. W. H. Schultz. With a Treatise on the Currency of the World. 8vo, boards. 1874. 5s. SCHWENDLER.-INSTRUCTIONS FOR TESTING TELEGRAPH LINES, and the Technical Arrangements in Offices. Written on behalf of the Government of India, under the Orders of the Director-General of Telegraphs in India. By Louis Schwen. dler. Vol. I., demy 8vo, pp. 248, cloth. 1878. 12s. Vol. II., demy 8vo, pp. xi. and 268, cloth. 1880. 9s.

SCOONES.-FAUST. A Tragedy. By Goethe. Translated into English Verse, by William Dalton Scoones. Fcap., pp. vi. and 230, cloth. 1879. 5s.

SCOTT. THE ENGLISH LIFE OF JESUS. By Thomas Scott. Crown 8vo, pp. xxviii. and 350, cloth. 1879. 2s. 6d.

SCOTUS.-A NOTE ON MR. GLADSTONE'S "The Peace to Come." By Scotus. 8vo, pp. 106. 1878. Cloth, 2s. 6d. ; paper wrapper, 1s. 6d.

SELL. THE FAITH OF ISLAM. By the Rev. E. Sell, Fellow of the University of Madras. Demy 8vo, pp. xiv. and 270, cloth. 1881. 6s. 6d.

SELL.-IHN-I-TAJWID; OR, ART OF READING THE QURAN. By the Rev. E. Sell,
B.D. 8vo, pp. 48, wrappers. 1882. 2s. 6d.

SELSS. GOETHE'S MINOR POEMS. Selected, Annotated, and Rearranged. By Albert
M. Selss, Ph.D. Crown 8vo, pp. xxxi. and 152, cloth. 1875. 3s. 6d.
SERMONS NEVER PREACHED. By Philip Phosphor. Crown 8vo, pp. vi. and 124,
cloth. 1878. 2s. 6d.

SEWELL.-REPORT ON THE AMARAVATI TOPE, and Excavations on its Site in 1877. By Robert Sewell, of the Madras C.S., &c. With four plates. Royal 4to, pp. 70, boards. 1880. 3s.

SEYPPEL.-SHARP, SHARPER, SHARPEST: A Humorous Tale of Old Egypt. Penned down and Depicted in the Year 1315 A.c. By C. M. Seyppel, Court Painter and Poet Laureate of His Majesty King Rhampsinit.III., and done into the English tongue by Two Mummies of the Old Dynasty. Memphis, 35, Mummies Arcade. (Ring three times). Imperial 8vo, pp. 42, in ragged canvas cover, with dilapidated edges, and string binding (? just as discovered), price 6s.

SHADWELL.-POLITICAL ECONOMY FOR THE PEOPLE. By J. L. Shadwell, Author of "A System of Political Economy." Fcap., pp. vi. and 154, limp cloth. 1880. 1s. 6d. SHAKESPEARE.—A NEW STUDY OF SHAKESPEARE: An Inquiry into the connection of the Plays and Poems, with the origins of the Classical Drama, and with the Platonic Philosophy, through the Mysteries. Demy 8vo, pp. xii. and 372, with Photograph of the Stratford Bust, cloth. 1884. 10s. 6d.

SHAKESPEARE'S CENTURIE OF PRAYSE; being Materials for a History of Opinion on Shakespeare and his Works, culled from Writers of the First Century after his Rise. By C. M. Ingleby. Medium 8vo, pp. xx. and 384. Stiff cover. 1874. £1, 1s. Large paper, fcap. 4to, boards. £2, 2s.

SHAKESPEARE.-HERMENEUTICS; OR, THE STILL LION. Being an Essay towards the Restoration of Shakespeare's Text. By C. M. Ingleby, M.A., LL.D., of Trinity College, Cambridge. Small 4to, pp. 168, boards. 1875. 6s.

SHAKESPEARE.-THE MAN AND THE Book. By C. M. Ingleby, M.A., LL.D. Small 4to. Part I., pp. 172, boards. 1877. 6s.

SHAKESPEARE.-OCCASIONAL PAPERS ON SHAKESPEARE; being the Second Part of "Shakespeare: the Man and the Book." By C. M. Ingleby, M. A., LL.D., V.P.R.S.L. Small 4to, pp. x. and 194, paper boards. 1881. 6s.

SHAKESPEARE'S BONES.-The Proposal to Disinter them, considered in relation to their possible bearing on his Portraiture: Illustrated by instances of Visits of the Living to the Dead. By C. M. Ingleby, LL.D., V.P.R.S.L. Fcap. 4to, pp. viii. and 48, boards. 1883. 1s. 6d.

SHAKESPEARE.-A NEW VARIORUM EDITION OF SHAKESPEARE.
Howard Furness. Royal 8vo. Vol. Romeo and Juliet.
cloth. 1871. 18s.-Vol. II. Macbeth. Pp. xix. and 492.
III. and IV. Hamlet. 2 vols. pp. xx. and 474 and 430.
King Lear. Pp. vi. and 504. 1880. 18s.
SHAKESPEARE.-CONCORDANCE TO SHAKESPEARE'S POEMS.
ness. Royal 8vo, cloth. 18s.

Edited by Horace Pp. xxiii. and 480, 1873. 188.-Vols. 1877. 36s.-Vol. V.

By Mrs. H. H. Fur

SHAKESPEARE-NOTES. By F. A. Leo. Demy 8vo, pp. viii. and 120, cloth. 1885. 6s.
SHAKSPERE SOCIETY (THE NEW).-Subscription, One Guinea per annum. List of
Publications on application.

SHERRING.—THE SACRED CITY OF THE HINDUS. An Account of Benares in
Ancient and Modern Times. By the Rev. M. A. Sherring, M.A., LL.D.; and
Prefaced with an Introduction by FitzEdward Hall, D.C.L. With Illustrations.
8vo, pp. xxxvi. and 388, cloth. 21s.

SHERRING.-HINDU TRIBES AND CASTES; together with an Account of the
Mohamedan Tribes of the North-West Frontier and of the Aboriginal Tribes of
the Central Provinces. By the Rev. M. A. Sherring, M.A., LL.B., Lond., &c.
4to. Vol. II. Pp. lxviii. and 376, cloth. 1879. £2, 8s.-Vol. III., with Index of
3 vols. Pp. xii. and 336, cloth. 1881. 32s.

SHERRING.-THE HINDOO PILGRIMS. By Rev. M. A. Sherring, M.A., LL.D.
Crown 8vo, pp. 126, cloth. 1878. 5s.

SHIELDS.—THE FINAL PHILOSOPHY; or, System of Perfectible Knowledge issuing
from the Harmony of Science and Religion. By Charles W. Shields, D.D., Pro-
fessor in Princeton College. Royal 8vo, pp. viii. and 610, cloth. 1878. 18s.
SIBREE. THE GREAT AFRICAN ISLAND. Chapters on Madagascar. A Popular
Account of Recent Researches in the Physical Geography, Geology, and Explora-
tion of the Country, and its Natural History and Botany; and in the Origin and
Divisions, Customs and Language, Superstitions, Folk-lore, and Religious Beliefs
and Practices of the Different Tribes. Together with Illustrations of Scripture
and Early Church History from Native Habits and Missionary Experience. By
the Rev. James Sibree, jun., F.R. G.S., Author of "Madagascar and its People,'
&c. 8vo, pp. xii. and 272, with Physical and Ethnological Maps and Four Illus-
trations, cloth. 1879. 12s.

SIBREE.-POEMS: including "Fancy,"
," "A Resting Place," &c. By John Sibree,
M.A., London. Crown 8vo, pp. iv. and 134, cloth. 1884. 4s.

SIMCOX.-EPISODES IN THE LIVES OF MEN, WOMEN, AND LOVERS. By Edith Sim-
Crown 8vo, pp. 312, cloth. 1882. 7s. 6d.

Cox.

SIMCOX.-NATURAL LAW. See English and Foreign Philosophical Library, Vol. IV.
SIME.-LESSING. See English and Foreign Philosophical Library, Extra Series,
Vols. I. and II.

SIMPSON-BAIKIE.—THE DRAMATIC UNITIES IN THE PRESENT DAY. By E. Simpson-
Baikie. Third Edition. Fcap. 8vo, pp. iv. and 108, cloth. 1878. 2s. 6d.
SIMPSON-BAIKIE.—THE INTERNATIONAL DICTIONARY for Naturalists and Sportsmen
in English, French, and German. By Edwin Simpson-Baikie. 8vo, pp. iv. and
284, cloth. 1880. 15s.

SINCLAIR. THE MESSENGER: A Poem. By Thomas Sinclair, M.A. Foolscap 8vo, pp. 174, cloth. 1875. 5s.

SINCLAIR. LOVES'S TRILOGY: A Poem. By Thomas Sinclair, M. A. Crown 8vo,
pp. 150, cloth. 1876. 5s.

SINCLAIR. THE MOUNT: Speech from its English Heights. By Thomas Sinclair,
M.A. Crown 8vo, pp. viii. and 302, cloth. 1877. 10s.

SINCLAIR.-GODDESS FORTUNE: A Novel. By Thomas Sinclair, M. A. Three vols.,
post 8vo, pp. viii.-302, 302, 274, cloth. 1884. 31s. 6d.

SINCLAIR. QUEST: A Collection of Essays. By Thomas Sinclair, M.A. Crown 8vo, pp. 184, cloth. 1885. 2s. 6d.

SINGER-HUNGARIAN GRAMMAR. See Trübner's Collection.

SINNETT. THE OCCULT WORLD. By A. P. Sinnett. Fourth Edition. With an Appendix of 20 pages, on the subject of Mr. Kiddle's Charge of Plagiarism. 8vo, pp. xx. and 206, cloth. 1884. 3s. 6d.

W