INFLUENCE OF AGE OF MOTHER. 



375 



Ratios of deficients among the males in the 209 fraternities 

 were arranged in a frequency distribution. Grouped to the 

 nearest 2 per cent, they ranged from o to 58 per cent, with 

 frequencies 57, 6, 4, 9, n, 21, 19, 8, 6, 5, 7, 5, 3, 8, 6, 6, 5, 5, o, 6, 

 2, o, o, 2, o, 2, o, i, i, 2, besides two fraternities each consisting 

 of a single deficient individual. 



131 of these fraternities included females with ratios of deficient 

 ranging from o to 34 per cent. Corresponding frequencies were 

 80, i, 10, 9, 7, 2, 4, 7, 2, 2, i, o, o, 3, i, o, o, 2. There were also 

 two small fraternities, one with one deficient to one normal and 

 the other with four deficient to two normal. 



Percentage of wasps dying immaturely were calculated for the 

 209 different fraternities. These ranged from o to 32 with 

 frequencies 125, n, 17, 19, 12, 5, 6, 2, 3, i, 3, o, i, i, 2, o, i. 



There were 10,335 males and 2,165 females in the entire group. 



Frequency According to Age of Mother. 



In a special line of this deficient stock consisting of thirty-seven 

 cultures there were 2,094 males with 540 or 25.788 per cent, 

 deficient, 468 females with 43 or 9.188 per cent, deficient, and 

 among the total of 2,732 there were 170 or 6.223 P er cent, dying 

 immature. 



Females are transferred every four or five days and culture 

 vials labelled a, b, c, etc. Thus if offspring be summarized 

 according to letter of vial average changes in progeny according 

 to age of mothers may be obtained. Table A and Chart I show 



TABLE A. 



OFFSPRING OF STRAIN DEFICIENT IN GENITALIA AND DIGESTIVE TRACT ARRANGED 

 ACCORDING TO AGE OF MOTHER (VIALS). 



