'912.] ANALYZED BY THE MENDELIAN METHOD. 185 



due to the fact that the alcohoHc parent was also mentally defective, 

 or that the alcoholism may, through poisoning the germ cells, be a 

 contributing cause of epilepsy. (Fig. 5.) 



In addition to the above, there were six matings where one parent 

 was insane and the other alcoholic. Of the 29 conceptions, 9 died in 

 infancy, 6 are unclassified, leaving 14 of whom something definite is 

 known. Of these, 7 were epileptic, 3 feeble-minded, 2 neurotic and 

 2 apparently normal. 



In considering the fraternities in which one of the parents is 

 either epileptic or feeble-minded, and the other " tainted," we have 

 classified as " tainted," the migrainous, neurotic and those who are 

 mentally weak. 



There were twenty-five fraternities with 161 conceptions; 60 

 died before 14 years of age, 24 are too young for classification, leav- 

 ing 'j'j for study. Of these, 27 or 35 per cent, are epileptic, 9, or 11 

 per cent., feeble-minded, 24 showing some slight nervous or mental 

 weakness, and 17 normal. 



In these matings we should expect 50 per cent, nulliplex and 50 

 per cent, simplex. We obtained 47 per cent, mentally defective and 

 53 per cent, apparently normal, or showing some slight weakness, 

 which is a very close fitting to the expectation. The discrepancy 

 may be accounted for by the possible classification as simplex of 

 individuals who are in reality nulliplex. (Fig. 6.) 



In six matings of an insane parent with a " tainted " one, there 

 were 45 conceptions; 10 died in infancy, 9 are unclassified. Of the 

 26 others, 9 were epileptic, none feeble-minded, 8 tainted, with 9 

 apparently normal. 



Nulliplex X Duplex. 



Under this classification we have tried to place the fraternities 

 of which one parent was epileptic or feeble-minded, and the other 

 reported normal. 



In thirty-eight fraternities with 223 conceptions ; 62 died in 

 infancy, 36 are too young for classification. Of the 125 others, 

 39 or 32 per cent, are epileptics, 14 or 11 per cent, are feeble-minded, 



