218 
collections of their father, the late distinguished William Mitten, 
became the property of the New York Botanical Garden by 
purchase, several years ago, this purchase having been made 
possible by generous friends of the Garden. 
I also transmitted, at the time of my visit, both to the Royal 
Gardens, Kew, and to the British Museum of Natural History, 
sets of herbarium specimens collected by our Mr. R. S. Williams 
n Bolivia in 1901-3, when he accompanied the expedition 
organized by Sir Martin Conway; these specimens have been 
in course of study by Dr. H. H. Rusby who has published 
descriptions of many of them, while others will be described 
by him in a paper now ready for printing. 
We were most cordially eee) at Kew and at the British 
Museum, and were given much important assistance in our work 
by the staffs of both institutions; and we are grateful to Col. 
Prain, Director of the Royal Gardens, and to Dr. Rendle, Keeper 
of the Museum’s Department of Botany, and their associates 
for this kind codperation. 
Respectfully submitted, 
L. Britron, 
Director-in-Chie. 
THE PLANT PHOTOGRAPH EXHIBIT. 
A set of 214 enlarged photographs, illustrating plant societies, 
habit-, flower-, and fruit-characters of trees and other higher 
plants, as well as habit and structural characters of some of the 
larger algae and fungi, has been installed in the systematic 
museum of the Garden. The photographs, which are 11 X 14 
inches in size, are mounted in glazed frames, 43 of them bearing 
four each of the bromide enlargements and seven bearing six each. 
The frames are fastened to the walls of the museum on the second 
floor and, so far as practicable, have been placed near the cases 
containing representatives of the species illustrated. The en- 
Jargements have been made chiefly from 4 X 5 negatives ob- 
tained by various Garden expeditions to Florida, the Bahamas, 
Cuba, Haiti, Santo Domingo, Porto Rico, and Panama. About 
