Lect. VI. AN HEREDITAEY AGRICULTURIST. 151 



is quite similar to that of the embryo of any known 

 Vertebrate, except that the post-oral arches are fewer in 

 number than in fishes. Nor would a thorough embryo- 

 logical investigation as to the conditions of things at this 

 stage, belie the outward form, since, part for part, and 

 organ for organ, the oneness of this with that of any 

 other type would be found to be, if not complete, yet 

 very great. 



In my next stage, when the embryo is the size of a 



Fig. 12. — Embryo of Mole {Talpa ewopwa), gnified 7 diameters 

 (2nd stage). 



little nut-grub, that is, one-third of an inch long, 

 measured along its curve, the form is very rapidly 

 specialised, and remarkably so, the fore-limbs parti- 

 cularly ; for although these are only, at present, broad 

 flippers, with marks of the five toes upon them, yet 

 their peculiar position, close to the head, reveals the 

 type at once. Yet, although the hereditary agriculturist 



