DIGESTIVE TRACT OF THE CAT. 



21 



tion of the ileum may be seen in the future position of the 

 ascending and transverse colons. 



It is difficult to say with certainty why the caecum 

 should here be found on the left side of the body, but the 

 following explanation seems to me to be a plausible one: 

 During the period of this migration of the ca3cum there must 



Fig. 12. 



The dissection of an embryo 65f mm, (Enlarged 4 diameters.) X., liver, 

 ileum. D., duodenum. S., stomach, cce., caecum. 0., omentum. K.^ 

 kidney, d. c, desc. colon. 



necessarily have been very little increase in the length of the 

 colon. This is confirmed by a glance at Figs. 11 and 12. In 

 the former, the colon makes a gentle curve, whereas in the 

 latter it makes a sharp one. Now, had the colon been 

 subject to either a continuous growth, or to a growth which 



