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planting of the large collection of late tulips in the beds of 
the court at conservatory range I. 
Investigations and Lectures 
My studies in horticultural botany have been continued, 
and the preparation of the list of the hardy woody plants 
in the Garden has been carried on and is now nearing com- 
pletion; my studies on the orchids have also been prose- 
cuted 
I have acted as one of the editors of Addisonia, continuing 
my supervision of the preparation of drawings for that 
periodical. In the regular public courses of the Garden 
I have given three of the lectures, and one in the special 
course arranged for delivery at the new central display 
greenhouse. 
Respectfully submitted, 
EORGE V. Nasu, 
Head Gardener. 
REPORT OF THE DIRECTOR OF THE LABORATORIES 
Dr. N. L. Britron, Direcror-1n-CuIEF. 
Sir: I have the honor to submit the following report for 
the year 1919. 
General Matters 
The routine duties connected with my position have been 
performed as in previous years. In addition I have, dur- 
ing the year, supervised courses in elementary plant 
physiology and in general botany given to students of the 
school in gardening for convalescent soldiers and sailors. 
This latter work has taken one day each week during nine 
months of the year. In general, the laboratories, experi- 
mental greenhouse, and breeding plots have been main- 
tained as in the previous year. Several matters pertaining 
to repair, additional equipment, and normal expansion are, 
however, awaiting attention. 
