The EfVplanation of Adaptations. 



613 



investigator claims to be of itself siifficiciit to disprove 

 the doctrine of selection. ^ These i)lants contain four 

 stamens in each flower, two large normal ones, and t\v(j 



Fig. 136. Miiscavi comosum phimosiim. 



small abnormal ones. The latter contain fertile jxillcn, 

 but never dehisce. The pollen is therefore absolutely 



*W. BuRCK. Kun. Akad. v. Wet., Amsterdam. 1901 : Allmm d 

 Natiuir, 1902. See also the earlier writings of this author on tacts 

 which cannot be explained by the theory of selection. 



