18 CONTENTS. 



CHAPTER XII. 



COMMON SALT, NITRATE OF SODA, SALTS OP AMMONIA, GYPSUM, LIME. 



Effect of these substances as elements of food ; their effect on the condition of the 

 soil Kuhlmaim's experiments with common salt, nitrate of soda, and salts of 

 ammonia , experiments with the same substances in Bavaria ; conclusions : 

 these matters are elements of food ; they are chemical means for preparing the 

 soil ; they cause the distribution of the food in the soil in the form proper for 

 the growth of plants Experiments by Pincus with gypsum and sulphate of 

 magnesia on clover; decrease of flowers and increase of stem and leaves of 

 clover by sulphates ; the crop is not in proportion to the quantity of sulphates 

 used Effect of gypsum not yet explained ; indication in the comportment of 

 clover soils with solution of gypsum ; such solution disperses potash and 

 magnesia in the soil Manures, their effect not explained by the composition of 

 plants produced by them Composition of the ash of clover manured with dif- 

 ferent substances Effect of lime ; experiments of Kuhlmann and Trager ; 

 comportment of lime-water with soils, ^. - .,.-> l . ' , . 316 



APPENDICES. 



Beech leaves and asparagus, their ash-constituents at different periods of growth 

 The amylum of the palm Motion of sap in plants Drain, lysimeter, river, and 

 bog water, their constituents Fontinalis antipyretica from two different waters, 

 ash-constituents Vegetation of maize in solutions of its food Experiments on 

 the growth of beans in pure and prepared turf, results Japanese agriculture 

 The cultivated soil of the torrid zone, its exhaustibility, its manure Analysis 

 of clover by Pincus Clover sickness, its causes, . . 332 



