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In Vol. 18, No. 2, November 20, 1934, page 152, the first word in the eighth line from the foot of the page, for "stop-cock" read "stop-clock." On the same page, in the third paragraph, the thirteenth line from the top, for 15.75 cm. read 15.75 mm.

THE PREPARATION OF THE GRADED COLLODION MEMBRANES OF ELFORD AND THEIR USE IN THE STUDY OF FILTERABLE VIRUSES