428 THE CAUSES OF THE 



XI 



applied to this case, might it not be said that here 

 was a case of a variation exhibiting the characters 

 and conditions of an animal occupying something 

 like an intermediate position between the Horse, 

 the Ass, the Quagga, and the Zebra, and from 

 which these had been developed ? In the same 

 way with regard even to Man. Every anatomist 

 will tell you that there is nothing commoner, in 

 dissecting the human body, than to meet with 

 what are called muscular variations that is, if 

 you dissect two bodies very carefully, you will prob- 

 ably find that the modes of attachment and in- 

 sertion of the muscles are not exactly the same in 

 both, there being great peculiarities in the mode 

 in which the muscles are arranged ; and it is very 

 singular, that in some dissections of the human 

 body you will come upon arrangements of the 

 muscles very similar indeed to the same parts 

 in the Apes. Is the conclusion in that case 

 to be, that this is like the black bars in the case 

 of the Pigeon, and that it indicates a recurrence 

 to the primitive type from which the animals 

 have been probably developed ? Truly, I think 

 that the opponents of modification and variation 

 had better leave the argument of recurrence 

 alone, or it may prove altogether too strong for 

 them. 



To sum up, the evidence as far as we have 

 gone is against the argument as to any limit to 

 divergences, so far as structure is concerned ; and 



