

US 



^Pf SCj^H-RB 



TO 



WILLIAM CLARK, Esq., of Bath. 



My Dear Sir, 



Notwithstanding the great advancements 

 in most departments of Natural History, it must 

 nevertheless he admitted^ that in Conchology and 

 the more minute portions of Zoology, our know- 

 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, specif c distinction can 

 hardly he determinately fixed. And it is pro- 

 bable that this ivill he first developed in the land 



