184 Some Expei'lments in Heredity 



the heat of the smmner and were not kept sufficiently damp. The 

 numbers are: qrossulariata ^ 12, grossulariata $ 16, " Q " </ 8, 



"<3"?8. 



A jjairing was also obtained between a " Q " J' and a grossulariata 

 $ heterozygous for "Q" (from grossulariata cT x " Q " $ )• From this 

 resulted 6 grossulariata cT, 6 grossnlariata $ , 5 " Q " ,/, 6 " Q " J . 



From three families "Q" </ x "Q" ? there resulted only 18 "Q" {J' 

 and $ ), no grossulariata. 



Included among the grossulariata there is another type, rather 

 indeterminate and merging imperceptibly into grossulariata, but quite 

 clear in some cases, which is distinguished by a more or less complete 

 gap in the centre of the row of black spots outside the yellow band 

 on the upper wing. Individuals of this type apjDear to be heterozygous 

 for " Q " (though only a small proportion of F^ grossulariata J" x " Q " J 

 were so marked, about 10 out of 50), for a pairing between two of this 

 type — of uncertain parentage — gave grossulariata (/ 17, grossulariata 



$ 14, "Q'V 8,"Q" ? 11- 



These experiments seem to make it certain that " Q " is a simple 

 recessive to grossulariata. The further jiairings, which were made with 

 a view to discovering the relations between " Q " and lacticolor, were 

 very unsatisfactory as regards quantitative results owing to various 

 causes, the chief being ill-advised forcing which left the larvae " hiber- 

 nating" during the summer of 1914 when owing to absence I could not 

 attend to them, and the necessity of carrying them about in unsuitable 

 boxes in 1915 : qualitatively however the results were interesting. 



A (i). The first pairing was made on April 5th, 1914, lacticolor 

 cf X " Q " %. This resulted in 3 grossulariata </ and 5 lacticolor J . 



(ii) Another on April 27th, 1914, between similar j^arents, lacticolor 

 (f X " Q" $ gave only 3 grossulariata. ^ . 



B. April 17th, 1914, "Q" ^ x lacticolor $. This jjairing gave 

 14 cT and 19 ? , all grossulariata in type (including some with the gap 

 in the row of black spots outside the yellow band mentioned above). 



The interest in these of course lies in the dominant resulting from 

 a cross between two different recessives. 



C. August 1st, 1914, a pairing was obtained between (/ and $ of 

 grossulariata type from fiimily B, i.e. F„ for both lacticolor and " Q." 

 This resulted in : 



15 grossulariata ^, 3 grossulariata ?, 7 " Q " c/', 5 lacticolor $. 



