APPENDIX. 



CHEMICAL ANALYSES OF THE TOBACCO PLANT. 



R. J. Davidson, at the Virginia experiment station, is doing 

 (1890-'97) a great amount of original analytical work of practical value, 

 from which we condense the following : 



Table IX. COMPOSITION OF VIRGINIA LEAF (AVERAGE OF MATURE 



BRADLEY BHOADLEAF, GOLD FINDER, PLANTS OF 

 WHITE BURLEY AND YELLOW ORINOCO). 



Analyses of seed of ten varieties of Virginia tobacco show that the 

 air-dried seed contains 5J to 6 per cent of water, of nitrogen 3.44 to 

 3.78 per cent, and of ash 3 to 4 per cent. Of the ash, about one-third is 

 phosphoric acid, one-third potash and one-fifth magnesia. The ash of 

 the seed contains over ten times as much phosphoric acid, about four 

 times as much magnesia and nearly one-fourth more potash than the 

 ash of tobacco leaf. 



Analyses of the whole platit, root, stem and leaf , at three stages 

 of growth, calculated from the average results for three leading vari- 

 eties (White Burley, Medley Pryor and Yellow Orinoco) show that 

 their composition at these three stages is alike only in nitrogen, soda 



485 



