PROCEEDINGS OF THE CLUB 
MEETING OF APRIL 15, 1931 
The meeting was called to order by President Sinnott at 
3:30 P.M. at the New York Botanical Garden with twenty-four 
members present. Minutes of the meetings of March 18 and 
April 7 were read and approved. 
Correspondence between Dr. Jamestown of the University 
of Tennessee and Mr. R. H. Torrey was presented and discussed, 
proposing the establishment of a southern branch of the Torrey 
Botanical Club at Knoxville, Tennessee. Dr. Sinnott appointed 
a committee of three to consider this matter. 
Dr. M. Demerec of the Carnegie Institution of Washington 
at Cold Spring Harbor, N. Y. gave an interesting talk on 
‘Variegation Studies with Delphinium Ajacis,” an abstract of 
which follows: 
By using for illustration chlorophyll variegation of Del- 
phinium and unstable characters of Drosophila piri evidence 
. 
was presented which indicates that unstability of genes. 1s 
the mutation occurred; and by assuming that on the average 
each cell generation doubles the size of a spot, it is possible to 
determine the frequency of mutability of the gene during sever 
by the gene being composed of smaller independent units 
_ Attention was called to the fact that variegations follow cell 
lineage and could therefore be used to advantage in studying the 
development of organs on which they are visible. 
The meeting adjourned at 5 P.M. 
Respectfully submitted, 
Forman T. McLean, Secretary 
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