Full text
PDF
. 1951 Jan 30;112(1-2):238–242. doi: 10.1113/jphysiol.1951.sp004526
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.