In Supplement No. 2, issued with the August, 1928, number of The Journal of Experimental Medicine, in the caption at the top of page 1, for July read August; for Vol. xlviii, No. 1, read Vol. xlviii, No. 2.
The attached slip may be pasted over the present caption.
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Copyright, 1928, by The Rockefeller Institute for Medical
Research New York
1928
