THE JOURNAL OF THE- FRANKLIN INSTITUTE, DEVOTED TO SCIENCE AND THE MECHANIC ARTS. EDITED BY Prof. Edwin J. Houston, A.M., Ph.D., Chairman; Prof. Arthur Beardsley, Mr. Alfred C. Harrison, Committee on Publications, with the Assistance of Dr. Wm. H. Wahl, VOL. CXLIV.-Nos. 859-864. (72D YEAR.) JULY-DECEMBER, 1897. PHILADELPHIA : Published by the Institute, at the Hall, 15 South Seventh Street. 1897. JOURNAL OF THE FRANKLIN INSTITUTE. Vol. CXLIV.-July-December, 1897. INDEX. Acetylene--price and commercial efficiency. 71 81, 171 70 Aluminum its utilization in the arts. (Hunt) Asphaltum in the island of Barbadoes Birkinbine, John. Mechanical and engineering progress as influenced BOOK NOTICES : Encyclopédie des Aide-Mémoire 61 73, 74, 159, 160 Brown, David Walter. An attempt at a synthetical demonstration of the 348 Carter, Oscar C. S. The upper Schuylkill river . 366 Cast iron, a special process for treating. (James) 80 Compass variation affected by geological structure in Bucks and Mont- 281 Cooper, John Haldeman, memorial of 154 D'Auria, Luigi. A preliminary communication on stellar dynamics 233 Differential calculus, an attempt at a synthetical demonstration of the 348 |