64 Evolution and its Consequences. 



enough wlien once developed. Sucli, e.g., as the whalebone 

 of the whale's mouth, the larynx of the kangaroo, pedicellarise 

 and bird's heads processes, and many other structures. 



2. That the sexual colours of apes, the beauty of shell-fish 

 and the complex mechanisms by which fertilisation is effected 

 in many orchids are quite beyond the power of natural 

 selection to develop. 



3. That modes of formation, such as in the human eye 

 and ear, in that they spring from simultaneous and con- 

 current modifications of distinct parts, have a remarkable 

 significance. 



4. That the independent origin of similar structures in 

 very different animal forms should be noted, and I adduced 

 evidence to show that similar modifications are sometimes 

 directly induced by obscure external conditions, as in the 

 sudden acclimatisation of English greyhounds in Mexico, 

 and in the loss of the tail in certain butterflies of certain 

 regions, and in the direct modification of young English 

 oysters when transported to the shore of the Mediterranean. 

 Moreover, it was shown that some groups of organic forms 

 exhibit a common tendency to remarkable developments of 

 particular kinds, as is the case with birds of paradise. 



5. That facts may be cited to support the theory of 

 specific stability (different in degree in different species), and 

 to demonstrate that reversion may take place in spite of the 

 Tnost careful selection in breeding. The value of the facts of 

 sterility in hybrids was also considered. 



6. That data bearing on the relation of species to time 

 may be brought forward, apparently fatal to their origin by 

 the action of natural selection. 



7. That the significant and important facts of the deep- 

 seated resemblances existing not only between different 

 individual animals, but between different parts of one and 

 the same individual, should be pondered over ; these points 



