6o4 BOTANY OF CROP PLANTS 



The United States leads all other countries in the produc- 

 tion of tobacco. In 19 14, Japan ranked second to the 

 United States, but its output was only about 10 per cent, of 

 that in this country. 



References 



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 Barnes, J.: The Potato (Solanum Tuberosum): Its History, Microscopical 



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 Bernard, Noel: Sur la tuberculization de la pomme de terre. Compt. 



Rend. Acad. Sci. (Paris), 132: 355-357, iQoi- 

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294-301, 1907. 

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503-525, 1905. 

 GooDSPEED, T. H.: Parthenogenesis, Parthenocarpy and Phenospermy in 



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106, 1890. 

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