191 1 ] A. J. ROSANOFF AND FLORENCE I. ORR 26l 



b. Psychosis in one subject and peculiar or abnormal disposi- 

 tion, but no actual psychosis, in brothers or sisters. 



c. Psychosis in one subject and isolated but clinically related 

 symptoms in brothers or sisters ; we find with particular frequency 

 dementia praecox = fainting spells or convulsions in childhood. 



d. Psychoses clinically not known to be related : senile dete- 

 rioration = peculiar hysteriform psychoses. 



6. Neuropathic conditions show only in about one-fourth of 

 the cases indications for commitment to sanitariums or public 

 institutions. The total incidence or neuropathic conditions may 

 be roughly estimated as aflfecting between 1.5 and 2 per cent of 

 the general population. 



7. It is further estimated that about 30 per cent of the general 

 population, without being actually neuropathic, carry the neuro- 

 pathic taint from their ancestors and are capable under certain 

 conditions of transmitting the neuropathic make-up to their 

 progeny. 



Acknowledgments. 



Many persons have assisted us in various ways in collecting 

 data for our study. We are indebted above all to our informants 

 who have confided to us most intimate family secrets for a purely 

 altruistic purpose. 



We owe a large debt of gratitude to Dr. William Austin Macy, 

 the superintendent of this hospital, whose unfailing sympathy with 

 the spirit of scientific research has made possible the present 

 study.- 



And we are also indebted to Dr. Charles B. Davenport, of the 

 Carnegie Institution of Washington, for some suggestions, a 

 good deal of general advice, and actual assistance. 



