160 



RAYMOND PEARL 



of the progeny as the germ dosage index for that mating, 

 can be expressed in a formula as follows: 



This 



where 



Total germ dosage index in days = {Mh — A cf ) + (Ma — A 9 ), 



M = Mean date of hatching of progeny. 

 Ac^ = Date when treatment of c? parent began. 

 A9 = Date when treatment of 9 parent began. 



It will be seen that this looks at the -matter of germinal dosage 

 from the standpoint of the zygote formed by the union of the 

 germ cells. If only one of the germ cells has been exposed to 

 influence by the alcohol it alone will contribute to the total 

 germ dosage index. If, on the other hand, both parents have 

 been treated, both gametes will contribute. This makes it 

 possible to put into one continuous series a numerical expression 

 of the degree of alcoholic treatment for both matings in which 



TABLE 6 

 Total germ dosage index for alcoholic matings in 1915 



NATURE OP MATING 



MATING 

 NUMBER 



MEAN DATE OF 

 HATCHING 



TOTAL GERM 

 D03AGE INDEX 



Ethyl & X Untreated 9 

 Methyl cf X Untreated 9 

 Methyl c? X Untreated 9 

 Ethyl d^ X Untreated 9 

 Ether cf X Untreated 9 

 Methyl cf X Untreated 9 

 Ether d" X Untreated 9 

 Ether cf X Untreated 9 

 Ether cf X Untreated 9 

 Ethyl cf X Untreated 9 

 Ethyl d^ X Untreated 9 

 Ethyl c?' X Ethyl 9 



Ethyl d^ X Ethyl 9 



Methyl cf X Methyl 9 

 Ether cf X Ether 9 



Methyl cf X Methyl 9 

 Ethyl d^ X Ethyl 9 



Ether d' X Ether 9 



Ether d" X Ether 9 



Methyl <? X Methyl. 9 



2119 

 2125 

 2123 

 2118 

 2111 

 2124 

 2104 

 2109 

 2110 

 2117 

 2116 

 2115 

 2112 

 2121 

 2106 

 2120 

 2113 

 2107 

 2108 

 2122 



April 



9 



9 



10 



14 

 15 

 16 

 16 

 21 

 22 

 26 

 27 



7 

 10 



7 

 15 

 27 

 20 

 27 

 27 

 27 



130 

 130 

 131 

 135 

 136 

 137 

 137 

 142 

 143 

 147 

 148 

 213 

 216 

 256 

 296 

 320 

 336 

 349 

 351 

 354 



