GENETIC TYPE AND THE ENDOCRIXES 747 



Conversely, the excitability level was lowered by removal of 

 the thyroid, thyroid and parathyroids, pituitary, supra renals 

 and gonads, so that the behavior was suggestive of that of 

 the phlegmatic type. 



The differences in the general behavior of different in- 

 dividuals may be due, at least in part, to inherent differences 

 in the amount and degree of activity of an endocrine gland 

 or group of glands. It may be possible that the activity 

 pattern of the gland is of importance in determining the 

 individual's pattern of behavior. 



The inherited pattern of the internal secretions may differ 

 but slightly between one "normal" individual and another 

 and, consequently, behavior may deviate but little from one 

 to the other. But when the pattern is a markedly distorted 

 one, the individual's behavior may show correspondingly 

 great deviation from the normal. The glands may thus be 

 found to play a significant role, not only in the production 

 of the various "normal" types or patterns of behavior, but 

 also in the production of the abnormal types. Consequently, 

 the present investigations bear not only upon the problems 

 confronting the psycho-physiologist, but upon those of the 

 psychiatrist as well. 



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