171 
The Source of the Drug Dioscorea, with a Consideration of the 
Dioscoreae Found in the United States. By Harley Harris 
Bartlett. Bulletin 189, Bureau of Plant Industry, 29 pp., 
1910 rice, 10 cents. 
Camphor Caluvatiens in the United States. By S.C. Hood and 
True. In Yearbook of the Department of Agriculture 
for I910, pp. 449-460, 3 pls. (Yearbook Separate No. 
551.) Price, 5 cents 
American Medicinal re and Herbs. By Alice Henkel. 
Bulletin fae oe of Plant Industry. 56 pp., 36 figs. 
wit ae a ae and Their Economic — 
—Black Sage; I].—Wild Sage; I1]—Swamp 
i Rabak. Bulletin 235, Bureau of Plant ae 
+ 5 figs. 1912. Price, 5 cents. 
a ae of Ginseng and Their Control. By H. H. Whetzel 
and - Rosenbaum. Bulletin = Bureau : Plant Industry. 
, 5 figs., 12 pls. 1912. I5c 
ae oe of ee ee on et a Unsulphured 
Hops. By W. W. Stockberger and Frank Rabak. Bulletin 
271, Bureau of PlantIndustry. 21 1912. Price, 5 cents. 
Individual Variation in the asia Content of Belladonna 
Plants. By Arthur F. Sievers. e Journal of Agricul- 
tural Research, November, 1913, oe 1, No. 2, pp. 129-146, 
I fig. Price, 25 cents. 
American Medicinal Flowers, Fruits, and Seeds. By Alice 
Henkel. Bulletin 2 . pas artment of Agriculture, 16 pp., 
12 figs. 1913. Price: 5 ce 
The Cultivation of American Gis ‘ Walter Van Fleet. 
Farmers’ Bulletin 551, 14 pp., 3 figs. 
Goldenseal under ee ay Walter ae oe Farmers’ 
Bulletin 613, 15 pp., 5 figs. 19 
Other References 
The Improvement of Medicinal Plants. By F. A. Miller. The 
Lilly Sci. Bulletin 1: 25-43 
