THE VOLATILE PART OF PLANTS. 



109 



AVERAGE QUANTITY OF ALBUMINOIDS IN VARIOUS VEGETABLE PRODUCTS. 



per cent. 



Maize fodder, green 1.2 



Beet tops ' 1.9 



Carrot tops ' 3.5 



Meadow grass ' 3.1 



Red clover ' 3.7 



"White clover ' 4.0 



Turnips, fresh 1.0 



Carrots ' 



Potatoes " 



Corn cobs, air-dry 



Straw of summer grain, air-dry. 



Straw of winter 



Pea straw 



Bean straw 



Meadow hay 



Red clover hay 



White clover hay 



Buckwheat kernel 



Barley 



Maize 



Rye 



Oat 



Wheat 



Pea 



Bean 



Lupine 



1.3 



2.0 



1.4 



2.0 



3.0 



7.3 



10.2 



8.5 



13.4 



14.9 



7.8 



10.0 



10.7 



11.0 



12.0 



13.2 



22.4 



24.1 



...34.5 



APPENDIX TO 4. 

 CHLOROPHYLL : TANNIN : ALKALOIDS. 



Before dismissing the subject of the Proximate Elements of plants, we 

 must notice several other substances of subordinate agricultural inter- 

 est. Two of these, viz., Chlorophyll and Tannin, though not figuring in 

 the analysis of agricultural plants, are nevertheless of almost universal 

 occurrence in all forms of vegetation, though usually in very minute 

 quantity. 



Chlorophyll, i. e. leaf-green, is the name applied to the substance 

 which occasions the green color in vegetation. It is found in all the sur- 

 face of annual plants and of the annually renewed parts of perennial 

 plants. It might readily be supposed that it constitutes a large portion 

 of the leaves of vegetation, but the fact is quite otherwise. The green 



