16 
As with previous lists published in the Recorp (1: 105; 2:121; 
3:123), it has been difficult to differentiate certain titles which 
might well be classified as botanical, although doubtless some of 
them were probably presented in departments of agriculture, or 
of physiological chemistry. 
The subjects of these doctorate theses in botany for 1915 were 
as follows: 
UNIVERSITY OF CHICAGO 
Hanna Caroline Aase: “ Vascular anatomy of the ‘ Megasporo- 
phyll’ in conifers.” 
Joseph Stuart Caldwell: “A study of the effects of certain 
antagonistic solutions upon the growth of Zea Mays.” 
Hermann Bacher Deutsch: “Effect of light upon the germina- 
tion of the spores of the true ferns.” 
James Frederick Groves: “ Life duration of seeds.” 
Andrew Henderson Hutchinson: “ Fertilization in Abies bal- 
samea.” 
James Palm Stober: “ A comparative study of winter and sum- 
mer leaves of various herbs.” 
HARVARD UNIVERSITY 
Guilford Bevil Reed: “Studies in plant oxidases.” 
William Henry Weston, Jr.: “On the development of Thraus- 
totheca, with a comparative examination of Dictyuchus.” 
CoLuMBIA UNIVERSITY 
Arthur Percival Tanberg: “Experiments on the amylase of 
Aspergillus Orygal.” 
CORNELL UNIVERSITY 
Elmer Eugene Barker: “ Heredity studies in the morning glory 
([pomea purpurea).” 
Harry Phillip Brown: ‘ Growth studies in forest trees.” 
Leonard Amby Maynard: “ The fixation of nitrogen by sweet 
clover.” 
George Adin Osner: “Leaf smut of timothy.” 
William Jacob Robbins: “ Digestion of starch by Penicillium 
camemberti.” 
