370 Domestic Intelligence. 
the root of a convolvulus or any other pliant. ‘The tuckahoe 
occurs from one to three feet under the surface of the earth. 
Its form is for the most part globular, and it is found from 
the sizeof an acorn to the bigness of a man’s head. Dr. 
T. has ascertained that the tuckahoe belongs to the genus 
sclerotium of T’ode and Person, and that it is an undescribed 
species of that genus which he calls S. gigantewm. Dr. 
Macbride supposed that the substance of the sclerotium con- 
sisted of gluten in a peculiar state. Dr. 'T. in an elaborate 
the solution gelatinizes by acids and most neutral salts. 
ley’s mountain, New-Jersey. It somewhat resembles 
graphite, but is much heavier and possesses very different 
characters. According to Dr. 'T’s analysis it consists of iron 
in a metallic state, and graphite, in the proportion of 54.25 
of the former, and 11.50 of the latter. He proposes for it 
the name of siderographite. 
Dr. Torrey sead an account of a new mineral from Schoo- 
New-J 
1819.—Mr. I. P. Brace, a corresponding member of the 
Society, communicated a memoir on the geology and min- 
eralogy of Litchfield in Connecticut, which he illustrated 
with a handsome suite of specimens. Litchfield is entirely 
primitive, and the basis rock of all the hills is gneiss, though 
granite is occasionally found alternating with it. The rocks 
lying on this are porphyritic granite, mica slate, sienite, 
primitive greenstone, steatite and limestone. Mount Pros- 
per, near the west end of the town, is entirely composed © 
porphyritic granite. Mount Tom, south west of the tow”, 
appears to be composed of rocks of sienite heaped together 
on a base of this granite. Among the minerals sent by Mr- 
Brace, were large and beautiful crystals of eyanite associa 
ted with tale and mica slate, staurotide with garnets, in mica 
slate, chalcedony, blue feldspar, and beryls in large crystals 
in_ granite. 
interesting species of fish, viz: Gobiomones grandicauda, 
Bodianns triacanthus. Esox- eirrhatus, Diodon «verrucosus, 
A memoir was read by. the president, Dr. Mitchill, on an 
nalhahiy 
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