364 Map of Mountains. — Epidoie. 



proves to be sulphate of strontian. Its specific gravity, I 

 find to be 3.85 to 3.90. The crystal a flattened prism of 

 six angles, formed as it were by the bevilment of two op- 

 posite lateral edges of a four sided prism, thus producing 

 four obtuse angles of 140° each, and leaving the other 

 two of 76° each. 1 have no crystal which will lead roe to 

 the form of its termination. 



This mineral is found in a small island, called in our maps 

 of last summer, Mouse Island; it lies about a mile west 

 Bass, or Put-in Bay Island. The crystals intersect and 

 cross each other in every possible direction, as will ap- 

 pear to you by some of the largest specimens. They easily 

 separate however, or rather break to pieces by a slight stroke 

 of the hammer. The gangue is a compact grey lime stone. 



5. Map of Mountains, 



CummingsandHilliard of Boston, have just published* an 

 engraving presenting at one view, the comparative heights of 

 the principal mountains in the world, wath corrections, and up- 

 w^ards of one hundred additions of the principal American 

 mountains. We have a copy of this map and think it well wor- 

 tliy of being possessed, both for geographical and geological 

 purposes, as it produces, at a coup d' cE.il, an impression, for 

 which no description can be an adequate substitute. The 

 annexed heights, latitudes and names, give the most impor- 

 tant particular information, and the map neatly mounted, 

 coloured and varnished, forms a handsome parlour picture, 



Ed. 



6. Epidote. 



Dr. Webster informs us, that very beautiful epidote and 

 fibrous prehnite have been lately found in the trap rocks of 

 Nahant, nine miles north east of Boston. 



• Price coloured and mounted on rollers $5,25, plain $4,00 — coloured 

 and npt varnished $4,25. 



