TABLE OF CONTENTS 
No. I, January, 1914 
(Issued 21 February, 19 14) 
PAGE 
The development of Agaricus arvensis and A. comtulus (with plates 
I and II) Geo. F. Atkinson 3 
Studies of teratological phenomena in their relation to evolution 
and the problems of heredity. I. A study of certain floral 
abnormalities in Nicotiana and their bearing on theories of 
dominance (with four text figures) Orland E. White 23 
Nuclear behavior in the promycelia of Caeoma nitens Burrill and 
Puccinia Peckiana Howe (with plate III), 
Louis Otto Kunkel 37 
An axial abscission of Impatiens SuUani as the result of traumatic 
stimuH Ross Aiken Gortner and J. Arthur Harris 48 
No. 2, February, 1914 
(Issued 3 April, 1914) 
On the mycorhizas of forest trees (with one text figure and plates 
IV-VII) W. B. McDouGALL 51 
Notes on the calculation of the osmotic pressure of expressed 
vegetable saps from the depression of the freezing point, 
with a table for the values of P for A = 0.001° to A = 2.999°, 
J. Arthur Harris and Ross Aiken Gortner 75 
The pyrenoid of Anthoceros (with plate VIII). .F. McAllister 79 
No. 3, March, 1914 
(Issued 6 May, 1914) 
Problems and progress in plant pathology L. R. Jones 97 
Some observations on the anatomy and other features of the 
"Black Knot" (with plates IX and X). . .Alb an Stewart 112 
Cleavage in Didymium Melanospermum (Pers.) MacBr. (with 
plates XI and XII) R. A. Harper 127 
iii 
