CLASSIFIED LIST OF REFERENCE WORKS 707 
Dillman, A.C. The production of seed flax. U.S. D. A. Farmer’s Bul, No. 1328, 
1924. 
Henkel, Alice. Weeds used in medicine. U. S. D. A. Farmer’s Bul. No. 188, 
1917, 
Henkel, Alice. American root drugs. U.S. D. A. Bur. Pl. Ind. Bul. 107, 1907. 
Hood, S. C. Commercial production of thymol from horsemint (Monarda 
punctata). Bul. No. 372, U.S. D. A. 
Kraemer, H. Cultivation of medicinal plants, pp. 727-748, in Applied and 
Economic Botany, Phila., 1914. 
Kilmer, F. B. The cultivertoll of medicinal plants. Am. Jour. Pharm., 87: 
343-359 and 421-435, 1915. (This article includes an extensive citation of 
the literature on the subject.) 
Rabak, F. The production of volatile oil and perfumery plants in the United 
States. U.S. D. A. Bur. Pl. Ind. Bul. No. 195, 1910. 
Rixford, G. P. Smyrna Fig culture. U.S. D. A. Bul. No. 732, 1918. 
Russell, G. A. Drying crude drugs. U.S. D. A. Farmer’s Bul. No. 1231, 1921. 
Stansel, R. H. and R. H. Wyche. Fig culture in the Gulf Coast region of Texas. 
Tex. Agr. Exp. Sta. Bul. no. 466, 1932. 
Stockberger, W. W. Drug plants under culivation: Farmer’s Bul. No. 663, 
U.S. D. A, 1915. 
Stockberger, W. W. Ginseng culture. U.S. D. A. Farmer’s Bul. No. 1184, 1928. 
Stockberger, W. W. Growing and curing hops. U. S. D. A. Farmer’s Bul. 
No. 304, 1928. 
Shrader, J. H. The castor oil industry. Bul. No. 867, U. =. 2. A. 1920. 
Sievers, A. D. Some effects of selection on the production of alkaloids in bella- 
donna. Bul. No. 306, U. 8. D. A., 1915. ° 
Sievers, A. F. American medicinal plants of commercial i jcilpia tice: iS: DA: 
misc, publ. 77, 1930. 
Sievers, Ae Peppermint and Spearmint as farm crops. U. S. D. A. Farmer’s 
Bul. No. 1555, 1929. 
Teetgen, A. B. Profitable herb growing and collecting. Country Life, London, 
1919, ee : os. 
Tschirch, A. Handbuch der et ci 2ed. Chr. H. Tauchnitz, Leipsig, 
1930, ; 
Van Fleet, W. Goldenseal ae cultivation. U.S. D. A. Farmer’s Bul. No. 613, 
Wided ak N. Almond varieties in the U. S. U. S. D. A. Dept. Bul. No. 1282, 
1924, 
! Pant Ecotocy AND GEOGRAPHY 
Campbell D. H. An outline of plant geography. Macmillan and Co., New 
xy Nee ee . methods in ecology. University Publishing Co., 
ements, 
Lincoln, , Neale ~~ on of Natural Conditions of the Ecological Society 
Committee on te a ide to the Americas. Edited by V. E. Shelford 
_ Naturalists’ gui 
a ae veilliaans and Wilkins Co., Baltimore, 1926. 
Engler, A., and O. Drude. Die Vegetation der Erde. 15v. 
gier, 
Leipsig, 1896-1923. 
W. Engelmann, 
