194 Miscellanies. 



low and quiet water on rocks, to which it adheres in an erect posi- 

 tion, the plane of the aperture being the base. 



Mr. J. E. Teschemacher 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 trvffie. 

 He also exhibited a specimen of yellow Trillium, received from Mr. 

 R. II. 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. Teschemacher 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 

 apple green ; some specimens are as dark and brilliant as the finest 

 Chrysoprase. The crystals consist for the most part of aggregated 

 groups with curvilinear faces. In one instance the form of aggrega- 

 tion was elliptical, imbedded in carbonate of lime. There are also 

 crystals of the primary form, a right rhombic prism ; the measure- 

 ments by the goniometer were as follows ; M or M' on / 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 

 water, occasionally rising from the midst of pure green prehnite ; in 

 some the modifications n, h, 1, 2, and i, 1,2 are visible. Feldspar; this 

 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 pure 

 white and nearly transparent curvilinear prehnite. Hornblende is 

 found in form of oblique rhombic prism with modifications C, K, Z; 

 crystals are small and black on white prehnite. Epidote is found in 

 minute dark green crystals with the usual terminations. Carbonate 

 of lime occurs in small crystals with modifications resembling dog 

 tooth spar ; also in the form of the primary rhomb half an inch in 



