ELEMENTS OF CROPS. 



358 



Carbon 45.68 



Hydrogen 5.43 



Oxygen 45.72 



Azote 0.43 



Ash 2.76 



100.00 



I fear that in this analysis the carbon and azote are rated too low. 



I have collected in two tables the results of the analyses as detail, 

 ed above. The first exhibits the quantity of dry matter and moisture 

 contained in each specimen ; the other, the elementary composition. 

 On careful examination of the numbers given in the second table, 

 certain substances will be found very analogous in composition. If 

 the ashes be deducted, the analogy becomes complete ; for many 

 substances differing widely both in character and properties, never- 

 theless appear to possess the same composition ; a fact which I do 

 not undertake to explain. 



TABLE OF THE PROPORTIONS OF WATER CONTAINED IN DIFFERENT 

 SUBSTANCES. 



Substancet. Dry matter. Water. 



Wheat 0.855 0.145 



Rye 0.834 0.166 



Oats 0.792 0.208 



Wheat-straw 0.740 0.260 



Rye-straw 0.813 0.187 



Oat-straw 0.713 0287 



Potato 0.241 0.759 



Field-beet 0.122 0.878 



Turnip 0.075 0.925 



Jerusalem potato 0.208 0.792 



Peas 0.914 0.086 



Pea-straw 0.882 0.118 



Clover-hay 0.790 0.210 



Jerusalem potato-stems • • • . • 0.871 0.129 



COMPOSITION OF THE SAME SUBSTANCES DRIED IN VACUO AT SSO* 



FAHR. 



30* 



