The Explanation of Adaptations. 
613 
investigator claims to be of itself sufficient to disprove 
the doctrine of selection. 1 These plants contain four 
stamens in each flower, two large normal ones, and two 
Fig. 136. Muscari comosum plumosiun. 
small abnormal ones. The latter contain fertile pollen, 
but never dehisce. The pollen is therefore absolutely 
1 W. BURCK, Kon. Akad. v. Wet., Amsterdam, 1901 ; Album d. 
Natuur, 1902. See also the earlier writings of this author on facts 
which cannot be explained by the theory of selection. 
