190 Mammalia, 



the rudiment of a circular tendon, developed on its pyloric 

 division* ; and the Omentum, attached to its convex border : 

 also the diffused fleshy- coloured Pancreas, with its ducts ; the 

 relatively large size of the Spleen ; and the Bile duct. 



The Stomach should now be pinned out on a cork, under 

 water, and a window should be made in one side of it in order 

 to expose the interior arrangement as much as possible in 

 situ. 



The Student will then note the dense white Epithelium of 

 the cardiac half of the Stomach, projecting with a smooth 

 outline into the pyloric half, and easily separable from the 

 outer coating of the Stomach : also the extreme vascularity of 

 the pyloric portion, and the patches of gastric glands specially 

 visible in that part, immediately opposite as well as near to 

 the entrance of the (Esophagus : this vascular coat terminating 

 equally abruptly with the epithelial coat of the cardiac por- 

 tion just beyond the oesophageal opening. If the (Esophagus 

 and Pylorus be now slit down, the extra- muscular develop- 

 ment around each will be noted, especially around the former '> 

 while the villous appearance at the commencement of the 

 small intestine contrasts markedly with the smooth or pitted 

 appearance of the mucous membrane of the pyloric portion 

 of the Stomach. A small piece should be teazed up and placed 

 under the microscope, by which means the membrane may be 

 seen to be formed almost entirely of minute vertical tubes, 

 which lie side by side. 



The exit of the vessels of the Spleen along one regular line 

 should be noted ; and, in section, the network of fibrous or 

 trabecular tissue, of which the mass is formed. No duct 

 exists in connection with the organ. 



The first inch and a-half of the small Intestine should be 

 slit down along the line of attachment of the mesentery : a 



* A bird-like characteristic. 



