THE VOLATILE PABT OF I.LANTS. 109 



kVBRAGE QUANTITY OP ALBUMINOIDS IN VARIOUS VEGETABLE PRODUCT? 



per cent. 



Maize fodder, green 1.2 



Beet tops &quot; 1.9 



Carrot tops &quot; 3.5 



Meadow grass &quot; 3.1 



Red clover &quot; 3.7 



White clover &quot; 4.0 



Turnips, fresh 1.0 



Carrots &quot; 1.3 



Potatoes &quot; 2.0 



Corn cobs, air-dry 1.4 



Straw of summer grain, air-dry 2.6 



Straw of winter &quot; &quot; 3.0 



Pea straw &quot; 7.3 



Bean straw &quot; 10.2 



Meadow hay * 8.5 



Red clover hay 13.4 



White clover hay &quot; 14.9 



Buckwheat kernel &quot; 7.8 



Barley &quot; &quot; 10.0 



Maize &quot; . &quot; 10.7 



Rye &quot; &quot; 11.0 



Oat &quot; &quot; 12.0 



Wheat &quot; &quot; 13.2 



Pea &quot; &quot; 22.4 



Bean &quot; 24.1 



Lupine &quot; 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 



