INDEX TO AMERICAN BOTANICAL LITERATURE 233 
Shaw, J. K., & Norton, J. B. The inheritance of seed coat color in 
garden beans. Massachusetts Agr. Exp. Sta. Bull. 185: 59-104. 
Ji 1918. 
Shufeldt, R. W. February—and plant life still sleeps in northern 
climes. Am. Forest. 25: 868-875. f. 1-14. F 1919. 
Smith, E. F. The cause of proliferation in Begonia phyllomaniaca. 
Proc. Nat, Acad. Sdi.g: 36,.37)..15 F i019. 
Soth, B. H. The cushion pink. Am. Bot. 25:1. F 1919. [Illust.] 
Spragg, F. A., & Nicholson, J.W. Rosenrye. Jour. Heredity 9: 375- 
978. f: 15,10- OP 190i 
Stakman, E. C., & Levine, M. N. Effect of certain ecological factors 
on the morphology of the urediniospores of Puccinia graminis. 
Jour. Agr. Research 16: 43-77. 13 Ja 1919. 
Steil, W. N. A study of apogamy iu Nephrodium hirtipes, Hk. Ann. 
Bot. 33: 109-132. pl. 5-7. Ja 1919. 
Stevens, F. L. Two Illinois rhubarb diseases. Illinois Agr. Exp. Sta. 
Bull. 213- 299-312. f. I-19. Ja 1919. 
Stevenson, J. A. Catalogo de las enfermedades fungosas y no para- 
siticas que atacan las plantas economicas de Puerto Rico. Rev. Agr. 
Puerto Rico 2: 23-33. Ja 1919. 
Tanaka,T. New Japanese fungi. Notes and translations—VI. Mycolo- 
gia 11: 80-86. 17 Mr 1919;—VII. Mycologia 11: 148-154. My 1919. 
Taubenhaus, J. J. Pink root of onions. Science Il, gO: 217, 218. 
28 F 1919. 
Vries, H. de. Hugo de Vries Opera e periodicis collata—II. 1-566. 
Utrecht. 1918. 
Waksman, S. A. Studies on the proteolytic enzymes of soil fungi and 
Actinomycetes. Jour. Bact. 3: 509-530. N 1918. 
Ward, M. E. Galax aphylla introduced in Massachusetts. Rhodora 
at: 24. 10 F 1019. 
Weatherwax, P. Gametogenesis and fecundation in Zea Mays as the 
basis of xenia and heredity in the endosperm. Bull. Torrey Club 
46: 73-90. pl. 6,7 +f. 1, 2. 10 Mr 1919. 
Weir, J. R. Concerning the introduction into the United States of 
extralimitial wood-destroying fungi. Mycologia 11: 58-65. 17 Mr 
1919. 
Weir, J. R., & Hubert, E. E. The influence of thinning on western 
hemlock and grand fir infected with Echinodontium tinctorum. 
Jour. Forest. 17: 21-35. f. 1. Ja 1919. 
