An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
As a library, NLM provides access to scientific literature. Inclusion in an NLM database does not imply endorsement of, or agreement with,
the contents by NLM or the National Institutes of Health.
Learn more:
PMC Disclaimer
|
PMC Copyright Notice
1Station for Experimental Evolution, Cold Spring Harbor, N. Y.
1
Part of paper presented before the Physiol. Sect. of the Bot. Soc. of America, Dec. 31, 1925. The investigation was carried on under a grant from the Committee of the National Research Council for Research on Sex Problems to whom the authors gratefully acknowledge their indebtedness.