+ 
ae : 
rock strata of the island. 
~ analogous in some respects. — 
" is probable that the specimens are from a formation of ae pe 
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ay Miscellanies. ee | 
SEthslcarcous Spar, white, massive, from a vein of =— same in one of the of 
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Saline Sandstone, ‘aaa Singular configurations, cellular, caren 
ous, and sometimes botryoidal. The forms seem to be derived from the 
accidental solution of the salt, and wasting away of the sandstone irregu- 
larly. 
One triangular specimen of saline sandstone is in the form of an irreg- 
ular tetrahedron, the two axes being unequal. The planes are wasted 
away, and the solid angles not, so that a continuation of the same pro- 
cess would leave a cellular substance like the others, but regular. This 
form is said to be the most common, and although it is not decidedly a 
crystal, the tendency of its component parts to crystallize and the sym- 
metry of this specimen, increase the probability that it is. Further spe 
‘cimens and observations are desirable, and the observer should be ac- 
quainted with the sandstone of Fontainbleau, which suggests itself as 
The geological specimens from the same island are compact Quartz 
rock from the summit, Basaltiform rock, but its identity with basalt is 
doubtful ; the forms are the chief resemblance in the specimens exhib- 
ited, which specimens are argillaceous and ferruginous. ‘Their exposure 
€. the weather and contact with other mineral substances, may have 
some change; and as basalt is sometimes liable to decomposition, 
Striped or Variegated Sandstones. 
- Light Colored Clay Slate. 
and, and fossils are contained 
sland offers to the geologist 
With ir “accompanying minerals 
SEI vation than is usual in so small @ 
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a a a ee 
; “space. ~The committee cannot giveth desired geological description for 
the want of other facts, but hopes to them 
The fossils consist of small bivalves i in the olay slate. 
_— Trigonia i in graywacke, and casts of Trigonia i in the red = 
_ Ammonites and casts of ammonites, and some small Isocard 
BE Dr. Brinckerhoff has also” Seon a variety of the rolled pebbles of 
hyries of different colors, the feld- 
erall white 5 ; siliceous pebbles 
