174 EVOLUTION 



of Something 



P.U not- i 



getting. weaker -Ver eneration. 



The theory of germinal sflfcptl 1 J X P f 

 ^i 51 - dealing like Mendel's 



theory of gametic segregation with the in- 

 visible, but it may be nevertheless useful 

 in enabling us provisionally to formulate a 

 number of very puzzling facts, and in sug- 

 gesting experimental work, on which, even- 

 tually, we must base our conclusions as to 

 these abstruse questions. 



RP 1fi r i1'iio Tl 



MB j^Liiiid^i^J'ra-ufl tfr e --^ w iBdli Ti g 





c^casipnaj exaggeration of organsjbjejond the 



utJTEyT^as may be 



illustrated in artificial conditions bj^ thfi^six 



Japanese 



the occurrence of definitely directed, 

 appropriate, and simultaneous variations, 

 and much more besides. ,11 play?- ir>tn f ^ 

 "hg-yi^s r>f pfirSftH3l.gglgction: or, as Weismann 

 more elegantly phrases it, "It ^ippljps hp. 



s builds 



FAMILY AND (?ROUP"SELECTIONS. Though 

 Darwin did not wholly overlook this (indeed 

 in at least one notable passage he expresses 



