364 Map of Mountains —Epidote. 
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 
our obtuse on of 140° each, and leaving the other 
two of 76° each. I have no erystal which will lead me to 
the form of a termination. 
This mineral is found in a small island, called in our maps 
of last summer, Mouse Island; it lies salbts ut a mile west 
pe 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 isa compact grey lime stone. 
5. Map of Mosadsivns: 
Cummings and Hilliard of Boston, have just published* an 
oor presenting at one view, the com comparative heights of 
the principal mountains in the world, with moaned and up- 
wards of one hundred additions of the principal American 
mountains. We have a copy of this map and think it well wor- 
thy of being possessed, both for geographical and geological 
purposes, as it produces, at a coup d’ wil, an impression, for 
which no description can be an adequate substitute. The 
annexed heights, latitudes and names, give the most impor- 
tant ae information, and the map neatly mounted, 
ante yenmeed: — a handsome parlour 9g 
6. Epidote. 
Dr. Webster sian eo us, that very beautiful epidote and 
fibrous prehnite have been egy ope in the trap rocks of 
Nahant, nine miles north east of Boston. 
*Price coloured snd mounted rollers $5,25, plain $4,00—eoloureé 
