Hudson Marble and KendalPs Thermometers. 37 ! 



7. Hudson Marble. 



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 

 from the vicinity of thai town. We did not see this mar- 

 ble inplace, 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. 



This marble is of a greyish 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. 



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. 

 Pool 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. 



