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194 . Miscellanies. 
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ty : : 
- apple green; some specimens are as dark and brilliant as the finest 
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low and quiet water on rocks, to which it adheres in an erect. posi- 
tion, the plane of the aperture being the base. ; rpg Bae 
r. J. E. Tescuemacuer presented a specimen of Elvella escu- — 
lenta from Oak Island. This is much esteemed as an article of food, 
and at certain seasons of the year is in great demand in the London € 
market ; it is not however so rich or so highly esteemed as the truffle. 
He also exhibited a specimen of yellow Trillium, received from Mr. 
R. H. Gardiner, of Gardiner, Me. ; this was first noticed by Dr. C. T. 
Jackson, and afterwards was procured by Mr. G. He also exhibited 
a new variety of the Marchantia, probably the triceps of Hitchcock's 
catalogue. « 
Mr. 'T. made a few remarks on the report of the surveyors of the 
State of N. York. He thought that besides giving descriptions of the 
actual state of things, they should also institute comparisons between 
them and similar appearances in other countries. Comparative in- 
formation was extremely valuable in an agricultural or an arboricul- 
tural point of view, especially as to the importance or profit of dif- 
ferent growths of timber; the same remarks might be applied to the 
botany of different countries. 
June 19, 1839.—G. B. Emerson, Esq., President, in the chair. 
Mr. J. E. TeschemMacnueEr read a report on the minerals found at 
the sienite quarry, at Milk row, in Charlestown. Prehnite is found 
_there, varying in color from pure translucent and opake white, to fine 
Chrysoprase. The crystals consist for the most part of aggregated 
groups with curvilinear faces. In one instance the form of aggreg® 
tion was elliptical, imbedded in carbonate of lime. There are 280 
erystals of the primary furm, a right rhombic prism; the measure 
ments by the goniometer were as follows; M or M’ on f 139° 45’; 
M on M’ 101° 05’; according to Phillips the last is 100°; the result 
stated however was procured from repeated observations. Quartz is 
met with in nodules and crystals; the latter small, but of the purest fy 
water, occasionally rising from the midst of pure green prehnite; a 
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some the modifications n, h, 1, 2, and i, 1,2 are visible. Feldspar; this ne 
is generally in a state of decomposition, which appears to commence — 
from the centre. In one specimen the prism was coated with bright 
green crystallized chlorite, interspersed with small masses of put? 
white and nearly transparent curvilinear prehnite. Hornblen e 18 
found in form of oblique rhombic prism with modifications C; K, q 
erystals are small and black on white prehnite. Epidote is found 10 
minute dark green crystals with the usual terminations. Carbonate 
of lime oceurs in small crystals with modifications resembling dog 
tooth spar; also in the form of the primary rhomb half an inch? — 
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