698 O. D. ANDERSON 



The average magnitude of the C-R rose considerably during 

 the extract period (9 to 14) and decreased afterward to 

 exactly the former level (9). 



The animal became noticeably more restless in the lab- 

 oratory during the intervals between one stimulus and another 

 throughout the period of the administration of the substance. 

 She looked about with quick, jerky movements, and shifted 

 from one place to another on the platform as though she was 

 not "satisfied" in any position. Such restlessness was in 

 contrast to her previously calm behavior under the same 

 stimulation conditions. No change could be detected in her 

 general behavior outside the laboratory. 



Dog 814 $ , bassethound X Saluki F 2 . Since this animal was 

 used in an experiment already described, i.e., the effect of 

 thyroid extract administration upon the normal dog, the 

 details of his training period need not be repeated here. 



Parathormone (Collip), 5 units daily, was administered 

 subcutaneously for 10 days. As in dog C-l, the behavior 

 tests were carried out each day 4 hours after the injection. 



The C-R was altered during the 10 day period. As in the 

 previous case, both the efficiency and magnitude of the re- 

 sponse were increased to some extent. 



As shown in table 16, the percentage of correct positive 

 responses showed a slight increase (82 per cent to 87 per cent) 

 and the percentage of correct negative responses to Met. 42 

 a marked increase (28 per cent to 75 per cent). The average 

 magnitude of the positive response increased slightly (13 to 

 17), and that of the negative response decreased sharply (6 



