In addition to the Correction in Vol. iii, No. 3, January 20, 1921, on page 149, Vol. iii, No. 2, November 20, 1920, line 13, for 92.57 read 89.10; page 154, lines 15, 28, and 32, for O read O+10; page 155, line 3 of the figure legend, for O read O+10.
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Copyright, 1920, by The Rockefeller Institute for Medical
Research
1920
