VALUE OF NOMENCLATURE. 491 



have just announced, namely, that to name well, it is neces- 

 sary to know well."* 



If this passage may appositely close this letter, it may 

 with equal propriety furnish a motto for my next ; and in- 

 cline you to lend a more willing ear to my exposition of 

 system after system, each of them being the best index you 

 can have to the condition of Conchology at the period of its 

 publication. 



* Cuvier in Edinb. New Phil. Journ. April 1829, p. 2. 



