280 FLORENCE POWDERMAKER 



may invalidate too definite inferences drawn from family studies. In 

 addition it is frequently found on intimate study of psychoses that these 

 conditions have arisen out of parental maladjustment none the less real, 

 because too subtle to be obvious in the ordinary investigation. The 

 assumption of an hereditary weakness can often be made in many cases, 

 but is felt that this factor can play only a variable part in etiology along 

 with other significant factors which are capable of at least rough evaluation. 



