422 p. W. WHITING 



82 type and 27 with cleft tongue, suggesting that the latter may 

 carry a factor acting as a simple recessive. 



Among the moths of this stock were also noticed several of 

 the sooty base variety (figure n). A pair of these produced 2 

 sooty, 1 male and 1 female, and 1 type, a female. This indicates 

 that sooty may be dominant to type. 



c. Calvert stock. Cleft tongue and sooty base. The moths 

 of the Calvert stock were rather light in color. Some of them 

 had wings with sooty base. 



Two non- virgin females produced 101 moths with normal 

 mouth parts and 2 with defective palpi. A sooty male was 

 paired with a type female whose virginity was not certain. There 

 were produced 7 type and 6 sooty. A pair of these type moths 

 produced 9 type and 2 with cleft tongue, suggesting again the 

 recessive character of cleft. The Calvert stock is of interest 

 as it is the source of the factor for sooty base used in later 

 experiments. 



d. Washington stock. Defective mouth parts. Sixteen non- 

 virgin females from the Washington stock, when isolated, pro- 

 duced 1523 type, 744 males and 779 females; 11 with defective 

 palpi, 7 males and 4 females; 3 with deformed tongue, 2 males 

 and 1 female, and 1 female with defective palpi and deformed 

 tongue. 



Two other non-virgin females were isolated from a fraternity 

 consisting of 44 moths with normal mouth parts. One of these 

 produced 163 type, 85 males and 78 females; 7 with cleft tongue; 

 5 males and 2 females, and 2 with defective palpi, 1 male and 1 

 female. The other produced 116 type, 54 males and 62 females, 

 and 40 with cleft tongue, 26 males and 14 females, thus closely 

 approximating the Mendelian three to one ratio. A pair of these 

 moths with cleft tongue produced 2 males and 1 female, all 

 having cleft tongue. This furnishes additional evidence that 

 cleft depends upon a recessive factor. 



e. Strain A of Washington stock. Black color and dark mid- 

 area. On October 1, 1916, two males and four non-virgin females 

 of typical color from strain A of Washington stock were isolated 

 in a fresh culture. From December 1 to December 14 there 



