IV CONTENTS. 



PAGK 



Composition of bones, 54 



Composition of ammonia, 62 



Common salt as a manure, 68 



Composition of crops, 76 



Composition of sugar, 78 



Carbon, quantity thrown from the lungs of a man daily, . 78 



Chlorine, how made, (A. 12) . . 90 



Carbonic acid gas, how inacte, (A. 15) . . 9'2 



Construction of drains, .'V (A. 26) . . 96 



Composition of urine, (A. 28) . . 1)7 



Chemical symbols, (A. 30) . . 99 



Chemical equivalents, (A. 31) . . 99 



Combinations of nitrogen and oxygen, . . . (A. 33) . . 100 

 Combinations of manganese and oxygen, . . (A. 34) . . 101 

 Composition of starch, gum and sugar, almost identi- 

 cal, (A. 37) .. 104 



Description of the gases, 18 



Difference in the ashes of plants, 26 



Distinction between organic and inorganic substances, . 35 



Difference in soils, 38 



Difference in light and heavy lands, 3i) 



Depth of drains, 40 



Difference in the dung of animals and the food they con- 

 sume, 5 ( J 



Diamond and charcoal chemically identical, . (A. 2) . . 8-7 



Division of food into two classes, (A. 47) . . 106 



Elementary substances, 15 



Excrement of birds as a manure, 64 



Elementary and compound bodies, .... (A. 20) . . 93 

 Explanation of the phrases by which salines are contra- 

 distinguished, (A. 24) . . 95 



Food of plants, 26 



Food of plants its sources, 27 



Flesh as a manure, 53 



Fish as a manure, 66 



