78 



THE RELATIONS OF MAN 



accurately, and only, at last, receives the touches which 

 stamp its final character. 



Thus, at length, the young puppy assumes such a form 

 as is shewn in Fig. 14, 0. In this condition it has a dis- 



FIG. 14. A. Earliest rudiment of the Dog. B. Rudiment further advanced, 

 showing the foundations of the head, tail, and vertebral col- 

 umn. C. The very young puppy, with attached ends of the 

 yelk-sac and allantois, and invested in the amnion. 



proportionately large head, as dissimilar to that of a dog 

 as the bud-like limbs are unlike his legs. 



The remains of the yelk, which have not yet been ap- 

 plied to the nutrition and growth of the young animal, 

 are contained in a sac attached to the rudimentary intes- 

 tine, and termed the yelk sac, or * umbilical vesicle? Two 

 membranous bags, intended to subserve respectively the 

 protection and nutrition of the young creature, have been 

 developed from the skin and from the under and hinder 

 surface of the body ; the former, the so-called ' amnion? is 

 a sac filled with fluid, which invests the whole body of the 



