GENES MODIFYING NOTCH. 



377 



A census of the short-Notch stock taken at the same time that the 

 two following records were made (April 1918), and under the same con- 

 ditions, gives for these mass-cultures the results shown in table 14. 



TABLE 14. Short-Notch stock for control. (Sh. Notch 9 by eosin cf .) 



Here, as is usual, an eosin-eyed father had been bred to a red-eyed 

 short-Notch mother. The expected classes (non-crossovers and cross- 

 overs) are given in the first three columns, while the red-eyed Notch 

 females are put into five classes that follow, viz, type atavistic; type 

 a, " intermediate"; type a+ "intermediate" standing between a and 

 6; type 6 "common" short Notch; type 6+ standing between 6 and 

 c; and type c "short Notch," the modal class. 



A cross between sisters of the mothers of the above stock (short 

 Notch) and wild males was made. The FI results are shown in table 

 15, in which the same classification of the FI Notch females as that 

 just given for the stock control was made. 



TABLE 15. Short Notch 9 by wild cf . 



Table 15 shows the wide variability of FI. The extreme plus variants, 

 i. e., the extreme short Notch class, are owing to three bottles where 

 non-virginity of the female would be the simplest solution were it not 

 that only 12-hour females were used, which, while still leaving open 



