ile 
the guests of the Brooklyn Botanic Garden on the third day, and 
of the New York Botanical Garden and the Boyce Thompson In- 
stitute on the other two days. At the close of the sessions for 
the reading of papers the delegates were conducted on a tour of 
inspection of the conservatories, buildings, and grounds. 
International Congress of Plant Sciences 
This was (in reality, though not officially) the Fourth Inter- 
national Botanical Congress, the third having been held in Brus- 
sels in 1910. The date of the Fourth Congress was delayed and 
the place changed on account of the World War. All of the ses- 
sions were held at Cornell University, Ithaca. The director and 
three curators (Dr. Graves, Dr. White, and Mr. Taylor) attended 
as delegates from our Garden. 
The program included 229 papers, embodying the results of re- 
search, besides various popular lectures and addresses and round 
table discussions. Over goo botanists were present from about 
25 countries. Every delegate spoke English, and, with rare ex- 
ceptions, all the papers were presented in English. The Brooklyn 
Garden was one of several institutional patrons of the Congress. 
Many of the delegates visited our Garden before returning to 
their native lands. 
Research During 1926 
The investigations carried on during the year were in con- 
tinuation of projects on which reports of progress have previously 
been made—plant disease resistance, plant breeding and genetics, 
geographical distribution, the vegetation of Long Island, plant 
physiology (especially the effects of radium rays on germ cells), 
and the classification and nomenclature of plants. In connection 
with the latter subject the curator of plants, Dr. Gundersen, spent 
the last four months of the year in Great Britain and Europe, 
visiting botanical centers, and conferring with those actively en- 
gaged in systematic work. He was still in Europe at the close of 
the year 
The Station for Experimental Evolution (of the Carnegie In- 
stitution of Washington) at Cold Spring Harbor, Long Island, 
supplied the pedigreed plants (of Jimson Weed—Datura) whica 
