GENETIC TYPE AND THE ENDOCRINES 709 



istry, the lowering of blood calcium, since blood calcium is 

 about as low before tetany as during the seizure. 



This relationship is borne out by the further observations 

 that parathormone, which is known to raise the level of 

 blood calcium, also makes the animal more responsive to 

 stimulation before the seizure, and alleviates tetany if given 

 during an attack. 



In brief, then, removal of the parathyroid and thyroid 

 glands from two dogs was followed by a marked decrease 

 in the efficiency and in the magnitude of the conditioned 

 motor reflex. The negative reactions were improved. Both 

 the magnitude and the efficiency of the conditioned reflex 

 were increased considerably during parathormone adminis- 

 tration. 



THE INFLUENCE OP THE PITUITARY UPON BEHAVIOR 



THE EFFECT OF THE ADMINISTRATION OF A GENERAL EXTRACT 

 OF THE ANTERIOR LOBE IN THE NORMAL DOG 12 



Dog C-l $ , bassethound X shepherd F 3 . This quiet dog 

 was selected for this experiment because of her remarkable 

 stability in the C-E observed during the training experiments. 

 Negative stimulation was not used in this experiment. 



Since the behavior of the dog in the normal training period 

 has already been described in detail we may repeat only as 

 much of the data as is necessary to a clear exposition of the 

 results in the present experiment. 



General anterior lobe extract, 10 units daily, was admin- 

 istered subcutaneously for 12 days. The C-R test continued 

 uninterrupted. The salivary C-R was somewhat enhanced 

 as to efficiency and magnitude during the administration of 

 the substance. 



Table 19 shows that the percentage of correct responses 

 to the positive stimulus increased slightly (86 per cent to 

 90 per cent) and declined in the after period to below the 



l - Growth extract Squibb. 



