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REPORT OF THE HONORARY CURATOR OF FOSSIL PLANTS 
Dr. N. L. Brirron, Dirrector-1n-CuieEr. 
Sir: I have the honor to report as follows upon activities 
in connection with the paleobotanical work of the Garden 
during the year 1917: 
Early in the year a collection of fossil plants from Porto 
Rico—part of the material gathered in the joint natural 
history survey of the island by the New York Academy of 
Sciences and the American Museum of Natural History— 
was submitted to me for examination. The study of this 
collection has occupied a large part of the time at my dis- 
posal. The specimens are very imperfect, for the most 
part, and each one has to be drawn, as the character of the 
remains precludes the possibility of photographing them. 
During the months of April and May about six weeks were 
spent in Washington, working on the fossil flora of Alaska 
in connection with the United States Geological Survey. 
Certain features of this work have also received attention 
since my return. Respectfully submitted, 
RTHUR Ho.tick, 
Honorary Curator of Fossil Plants. 
REPORT OF THE HONORARY CURATOR OF MOSSES 
Dr. N. L. Britron, Direcror-1n-CuHieEr. 
Sir: No large collections of mosses have been purchased 
during the past year; 590 specimens have been received 
and 914 have been sent in exchange; this included some 
sets of Dr. Small’s Florida mosses, the largest set having 
been sent to Mr. Charles Deering, of Miami, Florida, two 
others having been placed with collectors in the same state, 
thus encouraging an interest and knowledge of the local 
flora. The Isle of Pines mosses have been sent to the 
Colegio de la Salle in Cuba, to the National Herbarium in 
Washington and to the Carnegie Museum in Pittsburgh, 
Pennsylvania. Exchanges have been continued with the 
Sullivant Moss Society, of which I have had the honor to 
