Dr. KiDD on the Mineralogy of St. David'' s, 93 



vicinity of Boston in North AmeHca ;* and should it ever receive 

 general confirmation, it might I think be fairly applied to the cor"- 

 rection of one part of the present nomenclature of Geology. I 

 would in that case, for instance, propose that the term sienite should 

 be generally applicable to the whole series, and that the slaty or 

 granular forms ©f it should be specifically described by those epi- 

 thets ; and thus, in a few instances at least, we should attain the 

 desirable object of banishing the term graiiwacke from the language 

 of mineralogy ; a term not only offensive from its harshness but still 

 more from its want of precision. 



* There is a paper (m this subject by M. Godon in the 15th vol. of the Annalcs da 

 IVIuseum d'lllstoirc Natiirelle, p. 455, the perusal of which will amply repay those who 

 Ciny be induced to read it. 



