EVOLUTION 



1015 



has been no evolution". That was surely a bad lapse from scientific 

 method ! 



The Isolation of Germ-cells. — Granting all that is reasonably 

 said as to this, it must not be made too much of, as if these were like 



9 WALNUT 3 ROSE 



3 PEA 



1 SINGLE 



Fig. 176. 



Combs in Poultry, illustrating Mendelian inheritance. From a specimen. A 

 cross between rose-comb and pea-comb yields walnut combs (first filial 

 generation, Fi). If these are inbred, the second filial generation (F2) 

 shows walnut, rose, pea, and single combs in the proportion 9:3:3:1, 

 which is characteristic of dihybridism, when the original parents differ 

 in two pairs of contrasted characters or allelomorphs, 



the precise and precious standards of our weights and measures 

 which must be kept protected from the ordinary usages of life. For 

 with all their individuality, can the germ-cells avoid being influenced 

 by the body which not only contains but maintains them before 

 and up to their maturation to functional life, and in mammals 



