OIO LECTURE V. 



vessels, which he considered as absorbents, 

 extending from the bowels, laterally nearly 

 the whole length of the animal, and termi- 

 nating in small vesicles, which lie in con- 

 tact with the respiratory organs. In the 

 former he found numerous minute tubes 

 continued from the intestines, which are of 

 considerable length, and which, after rami- 

 fying towards their extremities, terminate 

 in little ^val cells or cseca, which are lodged 

 in the sides of the animal, in contact with 

 the pulmonary vesicles. 



There are different preparations of these 

 parts in the Museum, and when the intes- 

 tines happen to contain a whitish substance, 

 it is also seen in the tubes and cells ; when 

 the bowels contain a blackish matter, it is 

 likewise found in these appendages. What 

 Mr. Hunter thought respecting this subject 

 is not known. Such tubes may be consi- 

 dered either as terminating in the intes- 

 tines, or proceeding from them. 



In order to attempt the investigation of 

 this subject, I requested Mr. Clift to inject 



