PLATE i 
A. —The original female used in the studies described, weighed when captured, 
April i, 1922, 32 gm. On August 20, just before the birth of six young, she weighed 
70 gm., and after their birth 54 gm. On May 20, 1923, just before the birth of six 
young she weighed 105 gm., and after the young were born 80 gm. 
B. —The old male when captured, April 1,1922, weighed only 36 gm. On August 6 
he-weighed 56 gm., and on May 20, 1923, 72 gm. Another male bom on May 25 
weighed when a year old 81 gm. 
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