TABLE OF CONTENTS 
V 
Page 
Environmental temperatures of fungi in nature (with one text figure) 
Neil E. Stevens 385 
The reduction divisions in the pollen mother cells of Oenothera fran- 
ciscana (with Plates XXV-XXVI I) Ralph E. Cleland 391 
No. 8, October 
Studies of the mechanism of the physiological 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 mildew in 
Oenothera. . Peter J. Klaphaak and H. H. Bartlett 446 
Growth of some parasitic fungi in synthetic culture media (with four 
text figures) H. C. Young and C. W. Bennett 459 
No. 9, November 
The structure of the starch grain (with nine text figures) 
O. L. Sponsler 471 
A study of the white heart-rot of locust, caused by Trametes robini- 
ophila (with three text figures) 
C. H. Kauffman and H. M. Kerber 493 
The origin and development of lamellae in Agaricus campestris and in 
certain species of Coprinus (with 12 text figures and Plates 
XXVIII-XXXV) Michael Levine 509 
No. 10, December 
The effect of Bordeaux mixture upon the chlorophyll content of the 
primordial leaves of the common bean, Phaseolus vulgaris L. 
W. A. Ruth 535 
The effect of low-temperature storage and freezing on fruits and 
vegetables Lon A. Hawkins 551 
Revision of the South American species of Cuscuta I. T. G. Yuncker 557 
Index to Volume IX 576 
(Dates of publication : No. i, Feb. 21; No. 2, Mar. 20; No. 3, Apr. 24; 
No. 4, May 15; No. 5, June 21; No. 6, July 12; No. 7, Aug. 30; No. 8. 
Oct. 20; No. 9, Nov. 27; No. 10, Jan. 8, 1923.) 
