72 Notice of the Geology of Troy. 



During our cursory notice of this work, we have cited v, 

 number of the most prominent facts which it contains, both 

 because they are in themselves important, and because we 

 were wilhng to call the attention of our readers both to 

 them, and to the volume in which they are contained. 

 Both are, in our view, entitled to great respect, and we con- 

 fess ourselves very much indebted to Mr. Schoolcraft for a 

 great mass of valuable information, which, in a connected 

 form, is, we beheve, no where else to be found. His state- 

 ments (as regards the most valuable part) are drawn from 

 his own researches and observations, and have, evidently 

 been the result of much effort, and of no small share of fatigue 

 and personal privation. We trust that so valuable a work 

 will not stop with a single edition, and perhaps we might 

 venture to suggest to the author, that in a second, he might 

 advantageously condense into one view, some facts which 

 are several times repeated in different parts of the volume ; 

 such as those respecting the granite and its connected rocks 

 —the lead ore and its associated minerals, &c. 



We consider the present work as an acquisition to out- 

 means of information respecting our mineral resources, and 

 believe, that it must be a regular volume of reference for all 

 those who are interested in the investigation of these 

 subjects. 



Art. VIII. — Geological Notice of Troy, — Extract of a- 

 letter to the Editor. 



The city of Troy is situated on the east bank of the 

 Hudson river, on an elevated plain, from eighteen to twen- 

 ty-four feet above the bed of the river. It is about one 

 mile and a half in length, and about sixty rods wide. When 

 digging for wells, &:c. we pass through a series of almost 

 uninterrupted gravel, of the coarsest and most sterile kind, 

 mixed with a vast number of pieces of quartz of various 

 colours, and all worn smooth, and rounded so as to be fit 

 for paving streets, &:c. : among these are many of the same 

 size and figure as before mentioned of horn stone, lydian 

 stone, sinople jasper, chlorite, (connected with quartz,) sili- 

 ceous slate, rubble stones, &c. Sometimes we meet with 

 a stratum of coarse blue clay or sand, but we uniformly 



