TABLE OF CONTENTS 
V 
The probable non-validity of the genera Botryodiplodia, Diplodi- 
ella, Chaetodiplodia, and Lasiodiplodia (with plates XII- 
XIV) J. J. Taubenhaus 324 
Factors influencing flower size in Nicotiana with special reference 
to questions of inheritance (with four text figures). 
T. H. GooDSPEED AND R. E. Clausen 332 
No. 8, October 
The utilization of certain pentoses and compounds of pentoses by 
Glomerella cingulata LoN A. Hawkins 375 
The question of the toxicity of distilled water. . .R. P. Hibbard 389 
An anatomical study of Gymnosporangium galls (with one text 
figure, and plates XV and XVI) Alban Stewart 402 
An extension to 5.99° of tables to determine the osmotic pressure 
of expressed vegetable saps from the depression of the 
freezing point J. Arthur Harris 418 
Calcium hypochlorite as a seed sterilizer. . . .James K. Wilson 420 
No. 9, November 
Seasonal duration of ascospore expulsion of Endothia parasitica 
(with six text figures). . . F. D. Heald and R. A. Studhalter 429 
Dimorphism in Coniothyrium pirinum Sheldon (with fifteen text 
figures) C. H. Crabill 449 
The genus Espeletia (with six text figures and plate XVII) 
Paul C. Standley 468 
A study of the relation of transpiration to the size and number 
of stomata (with one text figure) . 
Walter L. C. Muenscher 486 
No. 10, December 
A brief sketch of the life and work of Charles Edwin Bessey (with 
plate XVIII) Raymond J. Pool 505 
Heredity and mutation as cell phenomena . . . R. Ruggles Gates 5ig 
The relation between vegetative vigor and reproduction in some 
Saprolegniaceac (with two text figurCvs) . .Adrian J. Pieters 529 
Index to Volume II 577 
(Dates of publication, No. i, Feb. 18; No. 2, Apr. 3; No. 3, Apr. 
23; No. 4, May 13; No. 5, June 16; No. 6, July 17; No. 7, Aug. 18; 
No. 8, Nov. 4; No. 9, Dec; No. 10, Dec.) 
