XIV CONTENTS. 



Page 

 4. Results of experiments with sulphate of ammonia, . .192 



5. Results of experiments with muriate of ammonia (sal ammoniac,) 195 



6. Results of experiments with nitrate of ammonia, . . .197 



7. Results of comparative experiments with the different salts of am- 



monia, and with the nitrates of potash and soda, . . 198 



CHAPTER XIII. 



EXPERIMENTS WITH THE SALTS OF AMMONIA, Continued. 



1. Are the sensible effects of the salts of ammonia and of the nitrates 



in direct proportion to the quantity of nitrogen they respectively 

 contain? ........ 201 



2. Influence of the state of chemical combination in which the nitrogen 



exists in a substance ; on its efficacy as a manure. Comparative 

 experiments with gelatine, rape-cake, and sulphate of ammonia, on 

 the weight of the crop, ...... 203 



3. Influence of the quantity of nitrogen, and of the state of chemical 



combination in which it exists in a fertilising substance, on the 

 quality of the crop to which it has been applied, . . 207 



4. Suggestions for experiments with the carbonate, nitrate, muriate, and 



sulphate of ammonia, . . . . . .210 



5. Suggestions for experiments with the acetate, oxalate, and humate 



of ammonia, ....... 213 



6. Suggestions for experiments with the phosphate of ammonia, with 



the aminoniacal phosphate of soda, and with the ammoniacal phos- 

 phate of magnesia, ...... 214 



7. Suggestions for experiments with gelatine, oil-cake, urea, and nitrate 



of urea, 217 



CHAPTER XIV. 



EXPERIMENTS WITH LIME. 



1. General functions performed by lime in the soil and in the plant, . 219 



2. Natural differences of composition among limes and limestones, . 223 



3. Suggestions for experiments with crushed limestone, . . 227 



4. Suggestions for comparative experiments with different chalks and 



marls, ........ 228 



5. Result of an experiment with quicklime, applied alone to land pre- 



paring for wheat, ....... 230 



6. Suggestions for experiments with silicate of lime, and with burned 



limes which contain it, ...... 231 



7. Suggestions for experiments with magnesia, and with limes which 



contain it in considerable proportions, .... 234 



