WORKS ON AGRICULTURE, ETC. , 13 



Fifty-Seventh Edition, price Is. 



: A CATECHISM :: ^ 



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AGKICULTUKAL CHEMISTEY & GEOLOGY. 



By JAMES F. W. JOHNSTON, F.R.S.E., &c. 



THE object held in view in compiling the present little work was the preparation of a 

 manual sufficiently elementary to be used even in our humblest schools, yet so precise and 

 complete as to constitute in itself a complete course of instruction in the applied science of 

 which it treats. The reception it has experienced, as exemplified in the issue of a Fifty- 

 Seventh Edition, may be held as proof that in general estimation it has achieved its aim. 



The Work is arranged under the following sections, in the form of question and answer, 

 and is amply illustrated by diagrams : 



(1.) General relations of the plant, the soil, and the animal. (2.) Compound substances of which the 

 organic part of plants and animals consists. (3.) Elementary bodies of which the compound substances 

 contained in the organic part of plants, animals, and soils consist. (4.) Of the organic food of 

 plants. (5.) Composition and properties of water, ammonia, and nitric acid. (6.) Composition of woody 

 fibre, starch, sugar, gum, and hnmic acid, and how they are formed in the plant or the soil. (7.) Composi- 

 tion of fat, gluten, and flbrin, and how they are formed in the plant and the animal. (8.) Substances of 

 which the inorganic, mineral, or incombustible part of soils, plants, and animals consists. (9. ) Origin and 

 general characters of soils. (10.) Improvement of the soil by deep-ploughing, subsoiling, and draining. 

 (11.) Composition and material relations of the inorganic part of the soil and the plant. (12.) Effect of crop- 

 ping upon the soil. (13.) Vegetable manures. (14.) Of the parts of animals used as manures. (15.) Of the 

 droppings or dung of animals. (16.) Of saline and mineral manures. (17.) Of limestone, and of the burning 

 and use of lime. (18.) Of the proportions of starch, gluten, and fat, contained in the crops which the farmer 

 usually reaps. (19.) Uses of the starch of our crops in the feeding of animals. (20.) Uses of the gluten, fat, 

 and mineral matter of plants in the feeding of animals. (21.) Of milk and dairy produce, and the feeding of 

 milk cows. 



Eighth Edition, price 6s. 6d. 



ELEMENTS 



OF 



AGKICULTURAL CHEMISTEY & GEOLOGY. 



By JAMES F. W. JOHNSTON, F.R.S.E., F.G.S., &c. 



MANY, it was apprehended, might be deterred by the voluminous appearance of the 

 Author's larger work ('Lectures on Agricultural Chemistry and Geology') from giving 

 due attention to the subject ; and partly for the sake of these, partly to provide a cheap 

 and accessible handbook of the subject, the present work was designed and executed by 

 the Author. Though styled " Elements," however, the book is not in the strict sense of 

 the word an elementary one, otherwise, at least, than as the student may proceed at once 

 to it without the slightest previous knowledge of the subject. It might safely have been 

 called Handbook of Agricultural Chemistry and Geology, inasmuch as it presents, in a 

 condensed rather than an abridged form, the entire subject it professes to take up. 

 The work is divided into sections, of which the following is a brief outline : 



(1) Object of the fanner what the sciences can do for him organic and inorganic substances relative 

 proportions of elementary bodies contained in plants. (2.) Forms in which the organic elements enter into 

 plants. (3.) Structure of plants. (4.) Inorganic substances of plants. (5.) Of soils. (0.) (7.) (8.) Direct 

 relation of geology to agriculture. (9. ) Of the physical, chemical, and botanical relations of soils. (10.) Of 

 the general improvement of the soil, and how the practical man will commence such improvement (11.) 

 Mechanical methods continued. (12.) Improvement of the soil by planting, and by the growth of wood. (13.) 



-, . . . 



crops. (23.) Of milk and its products. (24.) (25.) Of the fattening of animals. 



