In the issue dated September, 1939, Vol. 67, No. 1, p. 85, seventh line from top of page, change 0.666 to read 0.5; ninth line, change 1:27 to read 1:68. On p. 92, thirteenth line from foot of page, change mgm. to read gram. On p. 93, Table 1, third column from left, change mgm. to read gram. On p. 97, eleventh line from top of page, change Bartton to read Bratton. On p. 98, eleventh line from foot of page, insert the word "in" between words "excreted" and "feces."