90 



DR EICHARD J. A. BERRY. 



plate) than in the rest of the cacal wall, a characteristic portion 

 of which is seen in the upper portion of the plate. 



In the common goose, a bird resembling the domestic fowl 

 in the length of its caeca, the appearance presented by these are 

 very similar, and still more nearly resemble the type — the 

 pigeon. These appearances are depicted in Pis. X. 13 and X. 14. 

 There is the same predominance of lymphoid tissue, especially 



Fig. 3. 



-Diagrammatic scheme of the large intestine and two long c;eca of the 

 domestic fowl and the common goose. 



well shown in PL X. 13, whilst PI. X. 14 illustrates the fact that 

 in the goose, as in the pigeon, the predominance of lymphoid 

 tissue is very characteristic of the cfficura,as opposed to the rest 

 of the alimentary canal. 



All the birds examined agree very closely with the pigeon. 

 In all, lymphoid tissue is the special feature of the caecum, whilst 

 the long caeca of the domestic fowl prepare the way for another 

 fact, viz., that in animals with long caeca, the lymphoid tissue, 

 or at all events its contained leucocytes, tend to be dift'used 



