TABLE I. 



This table is represented graphically in the subjoined Figs. 16 and 17, 

 the abscissae representing the age periods and the ordinates the percentage 

 of cases whose age at the time of first attack falls within the given periods. 



FATHER 

 OFFSPRING 



MOTHER 

 OFFSPWM4. 



Fig. 1 6. 



*x 



CURVES SHOWING ANTEDATING. 



Fig. 17. 



Figs. 1 6 & 17 represent diagrammatically the age incidence of first attack in parents and offspring. 

 The first peak in the curve of the parent is due to the incidence of a larger number of cases of 

 general paralysis in the male as compared with the female at this age period. It would be 

 much more marked were it not for the fact that the cases of general paralysis among relatives 

 are not numerous comparatively with other forms of insanity. This is as we should expect, 

 for it is an acquired disease, and heredity plays a far less important part in its etiology than in 

 the true insanities. It will be observed that the parent curves, male and female, attain their 

 maximum in the involutional period. There is an obvious difference in the male and female 



