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WORKS BY PROFESSOR JOHNSTON.

The Third Edition, greatly Enlarged, price 48.,
ELEMENTS OF AGRICULTURAL CHEMISTRY

AND GEOLOGY.

This little work is intended to give a familiar and condensed outline

of the subjects treated of more fully in the Lectures. “ Nothing hitherto published has at all equalled it, both as regards true science and sound common sense.”—Quarterly Journal of Agriculture.

“ Of all the different works which have lately been published on the Chemistry of Agriculture, that now before us appears to be most likely to be of real service to the practical man."-Loudon's Gardener's Magazine.

ir easy style, are likely to prove interesting to the least instructed.” -Blackwood's Magazine.

II. SUGGESTIONS FOR EXPERIMENTS IN PRACTICAL

AGRICULTURE.

No. 1.-SUGGESTIONS FOR EXPERIMENTS WITH UNMIXED

MANURES, price 3d. No. II.- RESULTS OF EXPERIMENTS IN PRACTICAL AGRICUL

TURE, MADE IN 1841, price 3d. No. II1.-RESULTS OF EXPERIMENTS IN PRACTICAL AGRICUL

TURE, MADE IN 1842, WITH REMARKS AND ADDITIONAL

SUGGESTIONS, price 10d. No. IV.-RESULTS OF ADDITIONAL EXPERIMENTS, with RE

MARKS AND SUGGESTIONS, price 2d.

Competitors are strongly recommended to peruse Mr Johnston's Suggestions and Account of Experiments received in consequence thereof, and published by Messrs Blackwood, Edinburgh.' -Highland and Agricultural Society's Directions to competitors for Premiums.

WORKS BY PROFESSOR JOHNSTON-CONTINUED.

III.
LECTURES ON AGRICULTURAL CHEMISTRY

AND GEOLOGY.

PART

1.-ON THE ORGANIC CONSTITUENTS OF PLANTS-is com

pleted, price 6s.

PART II.-ON THE INORGANIC CONSTITUENTS OF PLANTS, price

43. 60.

Part III.-ON THE IMPROVEMENT OF THE SOIL BY MECHANICAL

MEANS AND BY MANURES, price 7s. 6d.

PART IV.- In course of publicationON FEEDING OF STOCK, &c.

“Unquestionably the most important contribution that has recently been made to popular science, and destined to exert an extensively beneficial influence in this country."-Silliman's American Journal of Science (Rev. of the Ame. rican Edition.)

" When finished, this book will form the only complete treatise on the whole subject to be found in any language."-Blackwood's Magazine.

“ The most complete account of Agricultural Chemistry we possess."-Royal Agr. Jour. A valuable and interesting course of Lectures.”-Quarterly Review.

IV.

Price ļs. WHAT CAN BE DONE FOR ENGLISH AGRICULTURE ?

A LETTER TO THE MARQUIS OF NORTHAMPTON,

President of the Royal Society. .

• v.

Price 2s. 6d.
THE ECONOMY OF A COAL FIELD.

Published by WM. BLACKWOOD & Sons, Edinburgh and London,

and Sold by all Booksellers.

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