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aceae, the latter being prepared for publication in Nort 
AMERICAN Fiora. He has also cooperated in minor details 
with Dr. Charles E. Fairman of Lyndonville, New York, 
in his monograph of the Lophiostomataceae, this work 
also being in connection with Norta AMERICAN FLora. 
A limited amount of time has been spent in cooperation 
with Dr. E. D. Clark in experimental work on the chem- 
istry of the heating of soils and its effect on the growth of 
plants. 
Mr. Percy Wilson, Assistant Curator, completed his 
monograph of the family Rutaceae, which was published 
early in the year ina part of volume 25 of Norrn AMERICAN 
Fiora. Most of his time not occupied with other cura- 
torial work was devoted to the sorting, labeling and study 
of the large collections of Cuban plants resulting from the 
systematic exploration of that island. Mr. Wilson also 
prepared and installed the Garden’s portion of the Budget 
Exhibit of the City of New York. He also published 
several illustrated papers on American plants and spent 
the greater part of December in exploration in western 
Cuba. 
Mrs. Britton voluntarily devoted the year to general 
correspondence for the upbuilding of the moss collection, 
thus arranging and making exchanges with European insti- 
tutions and individual bryologists, especially in order to 
secure specimens of species not represented in our collection, 
primarily in the various genera now being studied and 
monographed for NortH AMERICAN Fiora. She also spent 
some time at the Royal Gardens, Kew, England, and at 
the British Museum, studying their moss collection in con- 
nection with her work on NortH AMERICAN F Lora and in 
getting the geographical ranges and determinations of 
doubtful or unknown species of mosses, particularly from 
the West Indies. 
The writer when not occupied with the curatorial routine 
and detail, devoted his time to monographic work in con- 
nection with NortH AMERICAN Fora, having finished and 
