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, m 
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 haye 
gone is against the argument as to any limit to 
divergences, so far as structure is concerned ; and 
