322 ME. c. c. HUfisT : expekimental studies 



^0. 38. c? (7 X 10) : Short, albino, white. 



Gametes : Short, albino, grey 8f black, self. 

 No. 39. 5 (7 X 10) : Short, albino, white. 



Gametes : Short 8f Angora, grey ^ black, self. 

 No. 41. c? (3 X 10) : Angora, normal, black, Dutch. 



Gametes : Angora, normal Sf albino, black, Dutch. 

 No. 42. $ (8 X 2) : Angora, normal, grey, self. 



Gametes : Angora, normal 8f albino, grey Sf black, self. 

 No. 43. $ (1 X 12) : Short, normal, grey, self. 



Gametes : Short, normal, grey, self. 

 No. 44. $ (1 X 12) : Short, normal, grey, self. 



Gametes : Short 4- Angora, normal, grey !^' black, self. 

 No. 45. $(5x2): Short, albino, white. 



Gametes : Shoi't 8f Angora, albino, black, self. 

 No. 50. 5 (Pure Angora) : Angora, albino, white. 



Gametes : Angora, albino, grey Sf black, self. 

 No. 53. 5 (7 x 10) : Angora, normal, grey, Dutch. 



Gametes : Angora, normal 8," albino, grey, Dutch. 

 No. 54. (9 X 10) : Angora, normal, black, Dutch. 



Gametes : Angora, normal 8f albino, black, Dutch. 



CoKTCLUSIOlSrs. 



A study of the somatic characters and gametic factors of the 

 above individuals brings out the important fact that certain 

 individuals, identical in appearance and with precisely the same 

 ancestry, differ, in a regular and permanent manner, in their 

 breeding potentialities {e. g. Nos. 35 & 36). 



In such cases it is evident that neitber the outward appearance 

 of the individual nor a knowledge of its ancestry is a safe guide 

 to its breeding potentialities (it is only in the case of recessive 

 characters, of any ancestry, that the soma is a true guide), while, 

 on the other hand, as the above experiments show, a knowledge 

 of its gametic constitution and of the various dominances 

 provides a sure guide. 



Once the gametic formula of each individual has been deter- 

 mined by Mendelian analysis, the future results of any matings 

 can be foreseen with accuracy, whereas a knowledge simply of 

 the somatic characters of an individual and its ancestors is 

 altogether unavailing. 



The true measure of heredity therefore is neither the somatic 



