216 LECTURE V. 



cumstances I have alluded to could excite 

 wonder. He would labour, as he always had 

 done, to ascertain facts, and the additional 

 facts would, on this, as on other occasions, 

 only serve to confirm his already well estab- 

 lished theory. 



In the present class of animals denomi- 

 nated Crustacea, Mr. Hunter examined the 

 lobster with particular attention, and has 

 left most beautiful drawings, as well as pre- 

 parations, demonstrating its anatomy in 

 general. He was probably induced to make 

 this attentive examination from considering 

 it as a large specimen of the insect kind, in 

 which the structure common to the whole 

 tribe might be more readily discovered and 

 displayed. With respect to its circulating 

 and pulmonary organs he says, " The heart 

 which is unilocular, propels the blood 

 throughout the body, which fluid receives 

 purification in its passage ; and that the 

 blood returns, both from the body and from 

 the lungs to the heart, which it throws out, 

 in a mixed state, equally to the body and 

 lungs." Every one is acquainted with the 



