148 CARL R. MOORE 



3.30 p.m. Mother on nest, IV and n/male in opposite corner. 



4.00 p.m. Feeding. 



5.30 p.m. Young covered up in nest — all three old ones away from 

 nest. 



8.45 p.m. Same. 



May 8 a.m. 



8.00 a.m. Mother and IV both on nest, IV removed, n/male in 

 opposite corner. 



9.30 a.m. Mother and IV on nest with young, n/male in opposite 

 corner. Mother removed from cage, leaving in cage only fem. male 

 (IV) and n/male. IV removed from nest. 



10.00 a.m. IV on nest with young, watched reactions for fifteen 

 minutes with Prof. M. M. Wells. IV trying to suckle young — abdo- 

 men greatly arched for young to get under, hind legs spread apart 

 when little ones approach that region of abdomen from beneath, 

 changes position slightly as young search from place to place for teats. 

 Proclaimed by Prof. Wells as non-questionable maternal reaction. 

 Young displaced from nest, IV replaces them — picks up young in 

 mouth — suddenly picking up one at a time carries four to opposite 

 end of cage placing them at side of sleeping n/male whose reactions 

 are wholly passive — young begin to crawl under him but he continues 

 to sleep. IV covers remaining two in nest, remain so for five minutes. 

 Young taken from under n/male and placed in center of cage, IV 

 comes off nest, picks up all and returns them to nest, IV disturbs n/male 

 apparently in search of young intrusted to his care, pushes him out of 

 corner. IV moving about cage — mother returned to cage. 



May 22. Litter in cage 37 — cage contained normal male, normal 

 female, two castrated males, two spayed females. 



Observed many times daily for twelve days (until young would 

 leave nest) never was normal male, castrated male, or spayed female 

 seen near young which were in end of cage in nest made by mother. 

 Were never seen to give any attention to j^oung in period of twelve 

 days observed. 



Two points in particular are established by consideration of 

 such a set of observations, especially those made at intervals 

 over a period of tw-o consecutive days: these are, 1) that the 

 feminized male (in this case rat no IV) does not merely display a 

 sporadic interest in the young rats, but that it is a continued 

 interest and apparently as characteristic as that of the mother, 

 and, 2) it gives not only a comparison of the feminized male be- 

 havior and that of the mother, but it also brings to attention 

 very forcibly the absolute passive reaction of the normal male. 

 Also the series of observations continuing over twelve days fails 



