tL 



TO 



WILLIAM CLARK, ESQ., of Bath. 



MY DEAR Sin, 



NOTWITHSTANDING the great advancements 

 in most departments of Natural History, it must 

 nevertheless be admitted) that in Conchology and 

 the more minute portions of Zoology, our knovi- 

 ledge, in its enlarged consideration, is scarcely 

 beyond its infancy. 



Microscopic investigation, and the most pa- 

 tient inquiries, must therefore lend their fullest 

 assistance : for till the animal has been dissected 

 and accurately displayed, specific distinction can 

 hardly be determinately fixed. And it is pro- 

 bable that this will be first developed in the land 



M94085 



