i916] Publications on Drug Plants 181 



The Sources of Arsenic in Certain Samples of Dried Hops. By 

 W. W. Stockberger. Part 4, pp. 41-46. 1908. (From Bulletin 

 121, Bureau of Plant Industry.) Price, 5 cents. 



American Medicinal Barks. By Alice Henkel. Pp. 59, figs. 45, 

 1909. (Bulletin 139, Bureau of Plant Industry.) Price, 15 

 cents. 



American Medicinal Leaves and Herbs. By Alice Henkel. Pp. 56, 

 figs. 36. 1911. (Bulletin 219, Bureau of Plant Industry.) 

 Price, 15 cents. 



The Diseases of Ginseng and Their Control. By H. H. Whetzel 

 and J. Rosenbaum. Pp. 44, figs. 5, pis. 12. 1912. (Bulletin 

 250, Bureau of Plant Industry.) Price 15 cents. 



American Medicinal Flowers, Fruits and Seeds. By Alice Henkel. 

 Pp. 16, figs. 12. 1913. (Bulletin 26, U. S. Department of Agri- 

 culture.) Price, 5 cents. 



Wild Volatile-Oil Plants and Their Economic Importance. I. — 

 Black Sage; II. — Wild Sage; III. — Swamp Bay. By Frank 

 Rabak. Pp. 37, figs. 6. 1912. (Bulletin 235, Bureau of Plant 

 Industry.) Price, 5 cents. 



Chapel Hill, N. C. 



