VIIL] HOMOLOGIES. 195 



is here contended that there is good evidence of the ex- 

 istence of some such special internal power, and that not 

 only from facts of comparative anatomy, hut also from 

 those of teratology^ and pathology. Such facts appear to 

 show, not only that there are homological internal rela- 

 tions, but that they are so strong and energetic as to re- 

 assert and re-exhibit themselves in creatures which, on 

 the Darwinian theory, are the descendants of others in 

 which they were much less marked. They are, in fact, 

 sometimes even more plain and distinct in animals of the 

 highest types than in inferior forms, and, moreover, this 

 deep-seated tendency acts even in diseased and abnormal 

 conditions. 



Mr. Darwin recognizes - these homological relations, and 

 does " not doubt that they may be mastered more or less 

 completely by Natural Selection." He does not, however, 

 give any explanation of these phenomena other than the 

 imposition on them of the name " laws of correlation ; " 

 and indeed he says : " The nature of the bond of correla- 

 tion is fi'equently quite obscure." Now, it is surely more 

 desirable to make use, if possible, of one conception than 

 to imagine a number of, to all appearance, separate and 

 independent " laws of correlation " between different parts 

 of each animal. 



But even some of his reasons for accepting these alleged 

 laws hardly appear well founded. Thus ]\Ir. Darwin, in 

 support of the existence of such a law of concomitant 

 variation as regards hair and teeth, brings forward the 

 cases of Julia Pastrana^ and a man of the Burmese Court, 



1 Tho scifnce of almormal forms. 



2 "Animals and Plants nndcr Domestication," vol. ii. p. 322; and 

 "Origin of Species," 5tli edition, 1869, p. 178. 



•^ A remarkable woman exhibited in London a few years ago. 



O 2 



