180 



ORGANS OF DIGESTION. 



Fig. 181. 



Tig. 182. 



cylindrical, as in fig. 181, which represents the gastric glands 

 of the pyloric portion of the stomach ; at others they are com- 

 pound. Fig. 182 represents the gastric 

 glands in Man ; at A is a section of the 

 stomach with all its elements, magnified 

 about three diameters ; B represents the 

 same glands, with their racemiform ter- 

 minations distended with fluid, as seen 

 with the microscope, and magnified about 

 twenty diameters ; the contents of these 

 glands are always dark and granular, and 

 the membranous walls are of extreme deli- 

 cacy. Lying between these are other glands 

 of a larger size, and having a much more 

 compound racemiform structure ; they lie 

 separate from each other, and contain a 

 transparent fluid, destined for a purpose 

 different to that secreted by the gastric 

 glands. Fig. 1 83 is an outline and highly 

 magnified view of one of these glands, 

 from the middle part of the human sto- 

 mach ; the excretory duct is composed of 

 three branches, which proceed from a mul- 

 titude of blind cells. Fig. 184 is another 

 gland of the same class, from the vicinity 

 of the pylorus, where they are more com- 

 mon than in other parts of the stomach ; 

 it is viewed under the same magnifying 

 power as fig. 181 ; this gland is more com- 

 pound in structure, and its contents are 

 more transparent than those of the other 

 gastric glands. Much difference of opi- 

 nion prevails regarding these organs : 

 we have followed Wagner in our de- 

 scription, as they accord with our own 

 microscopic investigations.* 



_ [ 330. The stomach of birds presents 



^^s>=^fiii a repetition of the type of structure which 



we have already seen in insects. In the 



* The stomach should be examined very soon after death, if correct 

 observations are to be made. 



