14 WORKS ON AGRICULTUKE, ETC. 



In Octavo, price 8s. 



EXPERIMENTAL AGRICULTURE: 



BEINO THE RESULTS OF PAST, AND SUGGESTIONS FOB FUTURE EXPERIMENTS 

 IN SCIENTIFIC AND PRACTICAL AGRICULTURE. 



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



IN the other works by the same Author there has been embodied all that is known with 

 any degree of certainty in regard to the application of chemistry to agriculture. There 

 are, however, a variety of important points about which there is as yet much obscurity, 

 and a vast deal altogether unknown. To explain these in as far as they are capable of 

 being immediately elucidated by experiment, is the scope of the present work. From the 

 considerations dwelt upon, a variety of suggestions as to experimenting in the field and 

 the feeding-house are evolved : these are presented in such a way as to point out to prac- 

 tical men what they may do for the advancement of the art of agriculture. The following 

 are the leading points elucidated : 



(1, 2.) The knowledge necessary in a snggester and maker of experiments. (3.) How experiments are to 

 be mad e and judged of. (4.) Influence of circumstances on the result of experiments. (5.) Preliminary 

 consideration connected with the making of experiments. (6.) Experiments with sulphuric acid, and with 

 the sulphates of potasb, soda, lime, magnesia, and iron. (7.) Experiments with gypsum, and the sulphates 

 of magnesia and iron. (8.) Do. with chloride of potassium, and with common salt. (9.) "With the chlorides 

 of magnesium and calcium, muriatic acid, and the fluoride of calcium. (10.) With the carbonates, phosphates, 

 silicates of potash and soda. (11.) With the nitrates of potash, soda, lime, and magnesia, (12.) With the 

 salts of ammonia. 



Fourth, Edition, 2s. 



INSTRUCTIONS FOR THE ANALYSIS 



OF 



SOILS, LIMESTONES, AND MANURES. 



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



THIS work is intended as a first help to practical and economical chemical analysis ; and 

 its value in this and other obvious ways to the farmer, the pharmaceutical chemist, the 

 youthful student, and to rural training-schools and agricultural laboratories, will be seen 

 by a perusal of the following brief notice of its contents : 



(1.) The work opens with a chapter showing how the physical properties of the soil are determined. 

 (2.) How its organic matter is estimated, (3.) and its saline matter examined. These are followed by (4.) a 

 chapter on the estimation of the saline matters, and an examination of natural water ; (5 ) and its earthy 

 matters; with notes on tile and fire clay. (6.) The analysis of ores by measure is then discussed. (7.) 

 General remarks on the analysis of soils, with practical suggestions thereon, follow. (8.) The analyses of 

 limestones and marls, and (9.) of saline manures, next succeed; and the work closes with (10.) an examina- 

 tion of bone manures, guanos, and oil-cakes. 



In small Octavo, price 6s. 



ON THE USE OF LIME IN AGRICULTURE. 



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



THIS work ia designed to throw together, in a convenient form, the results of practice, 

 and the suggestions of theory, in the use of a substance which has been called the basis of 

 all good husbandry, so important a part does it perform in its practice. The points dis- 

 cussed are the use of lime in its application to the soil ; the artificial states in which 

 these are made ; an investigation into the points as to whether it is indispensable to the 

 fertility of the land ; and when it should be applied. Its effects on the soil and the crops 

 are then stated, followed by a notice of the theory of '^s action ; its exhausting influence 

 on the soil ; the length of time which it acts ; and its eh< on animal and vegetable life ; 

 the work concluding with two elaborate chapters on the of lime as a sulphate and a 

 phosphate. 



