LECTURE V. 211 



the alimentary canal of the aphrodita with 

 fine injection, and it passed into these nu- 

 merous tubes, and caeca, all of which are 

 full J distended ; but we cannot observe 

 that the injection has gone further. I show 

 you this preparation, and you see these caeca 

 in their natural situation, from which they 

 are removed in the other specimens. I beg 

 leave also to mention, that being desirous 

 to ascertain how far the distributive vessels 

 of the lower kinds of animals admitted of 

 being injected from their digestive cavities, 

 as is the case in medusae, and also to observe, 

 whether any transudation took place through 

 their sides, I requested Mr. Clift to inflate 

 and inject with subtile liquors, the digestive 

 organs in echini, insects, and vermes ; and 

 as far as his enquiries have yet extended, 

 he finds the canal similar to that of the 

 higher classes, neither air, nor injection im- 

 pelled, escapes from it, either through its 

 sides, or by proceeding into vessels. 



According to the present arrangement 

 of the subjects of Comparative Anatomy, 

 insects form the next class to zoophytes, 



p 2 



