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REPORT OF THE DIRECTOR OF THE LABORATORIES 
Dr. N. L. Britron, Direcror-1n-CHier. 
Sir: I have the honor to submit the following report for 
the year I9I5. 
The Laboratories 
The arrangement and equipment of the laboratories 
have remained as in the preceding year and have been 
fully utilized for a considerable part of the year. 
Experimental Garden and Greenhouses 
The additional land which you added this year to the 
experimental plots has allowed some very desirable expan- 
sion of the experimental studies. All the facilities were 
fully in use. Additional greenhouse space would greatly 
facilitate investigations, especially those of students who 
wish to prosecute vigorously studies in heredity and 
pathology during the winter months and for which there 
is an increasing demand. For the study pursued by Mr. 
Cecil Yampolsky of the behavior of sex in Mercurialis, alarge 
number of plants were grown, both in the plots and in the 
greenhouses. About 3,000 plants of Primula are being 
grown in the greenhouse and cold frames for study by Mr. 
Edgar Altenberg. The efforts to grow Primula solely as a 
summer crop have not been successful. Several new students 
have begun investigations during the past autumn. Pro- 
fessor R. A. Harper has continued his genetical studies of 
corn at the Garden. 
Miscellaneous Duties 
The meteorological records at the Garden have been 
taken throughout the year and monthly summaries pub- 
lished in the Garden Journal. Ihave planned the program 
of the various monthly conferences of the staff and students 
of the Garden, reports of which have been printed in the 
Journal. During the past year, I also have continued as 
editor of the Journal. 
