NOTES AND COMMENT 



The Editor of Science includes in botany forty of the doctorates con- 

 ferred by American Universities in 1915 (Science 42: 555, 1915), but 

 the following list is intended to comprise the titles which may be con- 

 sidered appropriate for review in botanical journals, of which there are 

 forty-five as against a corrected estimate of thirty-eight in 1914. Some 

 of the titles are comprehensive and indicate subjects which pertain to 

 more than one of the main divisions of botany, but about twenty- 

 three appear to be of a physiological character, seven morphological 

 and embryological, six pathological, five ecological, two taxonomic, 

 and two genetical. The relative interest in the various phases of 

 botany is well illustrated by these figures. It is notable that all of the 

 five doctorates from Washington University are in the botanical list, 

 indicative of the activity of the Missouri Botanical Garden in pro- 

 moting research in the institution with which it is allied. If the experi- 

 ence of previous years is to be taken as an index many of these theses 

 will not reach publication for several months, and may be held for a 

 few years before being put into print. An effort will be made to col- 

 lect information concerning their publication. 



CORNELL UNIVERSITY 



Elmer Eugene Barker. Heredity Studies in the Morning Glory {Ipomea 

 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. 



James Kemp Plummer. The Effect of Oxygen and Carbon Dioxide on Nitri- 

 fication and Ammonification in Soils. 



William Jacob Robbins. Digestion of Starch by Penicillium (Camembertii) . 



Joseph Rosenbaum. The Phytophthora Disease of Ginseng. 



Constantine Demetry Shcrbakoff. Fusaria of Potatoes. 



James Kennith Wilson. Physiological Studies of Bacillus radicola of Soy 

 Bean (Sojus max Piper) and of Factors influencing Nodule Production. 



UNIVERSITY OF CHICAGO 



Banna Caroline Aase. Vascular Anatomy of the "Megasporophyll" in 

 Conifers. 



34G 



