VqL IX. OCTOBER, 192 
2 
No. 8 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
studies of the mechanism of the physiogical effects of certain mineral salts in altering the 
ratio of top growth to root growth in seed plants. ... . ... Thomas Wyatt Turner 415 
A preliminary notice of genetical studies of resistance to niildew in Oenothera. 
Peter J. Klaphaak and H. H. Bartlett 446 
Growth of some parasitic fungi in synthetic culture media. H. C. Young and C. W. Bennett 459 
PUBLISHED 
IN cooper.\tion with the botanical /^c^^iy 
BY THE 
BROOkLYN BOTANIC Gmj^Pfr n 
At Prince and Lemon Sts., Lancaster, Pa. ~ 
london agents 
WHELDON AND WESLEY, L^d. 
28 Essex Street, Strand, London, W. C. 2 
Eutared »« a«cx>nd-daM matter February 21, 1914, at the post ofBc* at Lancastei-. Penn»ylvaJiia, 
under the act of March 3, 1S79 
