On page 48 to 54, Vol. 13, No. 1, September 20, 1929, through a mistake in printing the image of the string in Figs. 2, 6, 7, 9, 12, and 14 appears double. To obviate any misunderstanding it should be stated that in the original photograph the string was always single, as in Fig. 13.
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Copyright, 1929, by The Rockefeller Institute for Medical Research
1929
