Hudson Marble and Kendall’s Thermometers. A713 
% Hudson Marble. aS. 
The territories of the United States are rich in marbles, 
well adapted by their beauty and firmness, to architectural 
and sepulchral and other ornamental, as well as useful pur- 
poses. We have omitted as yet to mention one which is 
wrought by Mr. Charles Darling at Hudson, and is obtained 
rom the vicinity of that town. We did not see this mar- 
ble in place, but no geologist would hesitate on inspecting it, 
to refer it to the transition class, and indeed Hudson is in 
the midst of that strip of transition country, which Mr. Ma- 
clure designates in his geological map, along both sides of 
the Hudson. oe . 
This marble is of agreyish colour, with a slight blush of red ; 
its structure is semi-crystalline and in some places highly 
crystalline, especially in and around the organized bodies, 
which, in vast numbers, it embraces. Among them, the en- 
crinite, is very conspicuous, and frequent, and when the mar- 
ble is polished, the organized bodies, congealed in a bright cal- 
careous bed, and often more brilliant themselves than the me- 
dium in which they are fixed, give it a very fine effect; this 
is particularly true in large slabs, which present great diver- 
sity of appearance and could scarcely be distinguished from 
the similar transition marble of the Peak of Derbyshire 
which it greatly resembles, and quite equals in beauty and 
firmness.—Ed. 
8. Thermometers. 4 
We have observed with satisfaction, the progressive im- 
provement in this country, in the manufacture of glass in its 
most important branches, and especially of thermometers, 
so indispensable to all researches on heat, and to many arts, 
depending on its laws. Mr. Fisher.of Philadelphia, Mr. 
ool of New-York, and Mr. Pollock of Boston, (besides 
probably others not within our knowledge or recollection) 
are advantageously known to the public, as manufacturers of 
thermometers, and of various articles, of philosophical ap- 
paratus. ‘Their situation, in our principal cities, gives them 
facilities for being known, and for introducing their articles 
to the public approbation which they have justly obtained. 
