290 MR. C. 0. HUEST : EXPERIMENTAL STUDIES 



pure Angoras, giving off gametes carrying the Angora factor 

 simply, with no trace of the short-coat factor carried (in the case 

 of 5 of them) by both their parents and one-half of their an- 

 cestors for several generations and probably many more. 



The short-coated individuals of the second generation tested 

 with Angoras and hybrids proved to be of two kinds, pure shorts 

 and hybrid shorts, the former producing all shorts and the latter 

 a mixture of shorts and Angoras. 



Out of 16 individuals tested, 5 were extracted from hybrids of 

 the first generation mated back with the original Angoras 

 (H X A), and these all proved to be hybrids in accordance with 

 the Mendelian expectation. 



One individual was extracted from a hybrid of the first gene- 

 ration mated back with one of the original shorts (H X S), and 

 this proved to be a hybrid, the Mendelian expectation for 2 such 

 individuals being 1 pure and 1 hybrid. 



The remaining 10 individuals were extracted from hybrids of 

 the first generation bred together (H X H), and of these 4 proved 

 to be pure and 6 were hybrids ; the Mendelian expectation for 

 12 such individuals being 4 pure and 8 hybrids. 



The 4 pure extracted shorts mated with 3 Angoras and 4 

 hybrids produced 51 short-coated young, similar in appearance 

 to the pure and hybrid shorts. The matings were as follows: — ■ 



Table 7. 



Extracted Shorts x Angoras and Hybrids (F,). 



Matiiuis. Short. Angora. 



E S 30 X H 10 5 



E S 30 X H 10 7 



ES32xA2 5 



E S 82 X H 12 4 



E S 32 x H 10 : 5 



ES34XEA37 6 



E S 34 X E H 14 6 



E S 36 X E H 28 3 



E S 36 X H 10 5 



E S 36 X E A 26 6 



Total 51 



The extracted hybrid shorts mated together and also with 



