You are not currently logged in.
Access JSTOR through your library or other institution:
New Series, Vol. 132, No. 3425 (Aug. 19, 1960), pp. 457-461
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1706220
Page Count: 5
Preview not available
Science © 1960 American Association for the Advancement of Science