6o4 BOTANY OF CROP PLANTS 



The United States leads all other countries in the produc- 

 tion of tobacco. In 1914, 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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Transformations in After-ripening of the Potato Tuber. Bot. Gaz., 52: 



306-31S, 1911. 

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



Characters, and Structure. Ann. Rep. Trans. North Staffordshire Field, 



cl, 1902-03, pp. 96-ro6. 

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



Rend. Acad. Sci. (Paris), r32: 3SS-3S7, iQoi- 

 Berthault, Pierre: Recherches botaniques sur les varieties cultivees du 



Solanum tuberosum et les especes sauvages de Solanum tuberiferes voisins. 



Ann. Sci. Agron., 28: 1-59, 87-143, 173-216, 248-291, Paris, 1911. 

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 Indentification of Potato Varieties. la. Agr. Ext. Dept. Bull. 20: 1-32, 



194. 

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 Pollination of Forced Tomatoes. Mich. Agr. Exp. Sta. Spec. Bull. 39: 

 294-3or, 1907. 

 Gable, C. H.: The Wild Tomato. Jour. Hered., 6: 242, i9rs. 

 Gilmore, John W.: Quality in Potatoes. Cornell Agr. Exp. Sta. Bull. 230: 



503-525, 1905. 

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



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 Halstead, B. B.: Notes upon Stamens of Solanacese. Bot. Gaz., 15: 103- 



106, 1890. 

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Garden Varieties. 9th Ann. Rep. Mo. Bot. Gard., 53-1x0, 1898. 

 Jones, Donald F. : Natural Cross-pollination in the Tomato. Science, n. s., 



43: 509-510, 1916- 

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 Berlin, 1907. 



