THE VOLATILE PAET OF PLANTS. 



109 



AVBRAGE QUANTITT OF ALBUMINOIDS IN VAEIOUS VEGETABLE PBODUCTS. 



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 " 1.3 



Potatoes " 2.0 



Corn cobs, air-dry 1.4 



Straw of summer grain, air-dry 2.6 



Straw of winter " " 3.0 



Pea straw " 7.3 



Bean straw " 10.2 



Meadow hay •' 8.5 



Red clover hay •' 13.4 



White clover hay " 14.9 



Buckwheat kernel " 7.8 



Barley " " 10.0 



Maize " " 10.7 



Eye " " 11.0 



Oat " " 12.0 



Wheat " " 13.2 



Pea " " 32.4 



■■ Bean " " 24.1 



Lupine " '• 34.5 



APPENDIX TO § 4. 

 Chlobophtll : 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. 



Cliloropbyll, 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 tact is quite otherwise. The green 



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