ii Scientific intelligence. J^iji% 



becomes white, and melts very easily into a greyish globule, but with- 

 out being reduced even with charcoal. From my own experiments, I 

 have found, 1. That orange-red phosphate of lead behaves in some 

 respects differently from all the varieties tested by these eminent wri- 

 ters. 2. That minute green crystals from Suvside lead mine in Nither- 

 dale, Yorkshire, gave the same results as detailed by Berzelius and 

 Brongniart, but more particularly by Phillips. 3. That opaque pea- 

 green botryoidal phosphate from Gerrtmny, and pale-yellow from the 

 lead hill mines, in the reducing flame first became white, and on a 

 stronger heat being applied, melted into a grey opaque globule. With 

 the addition of borax, it effervesced, burned, and was at length reduced 

 into a glass, milky while cooling, but transparent when cold, and con- 

 taining small globules of lead. Thus it appears, that the crystallized 

 arid botryoidal, the orange-red, pale-yellow, and green phosphates of 

 lead, are variously aflected by the action of fire, which leads to the 

 Conclusion that different ingredients, as well as ingredients in very 

 different proportions, must enter into the composition of the several 

 varieties of this ore; and in its description, it is not sufficient to men- 

 tion how any si?ig/e 'var'ieh/ behaves under the influence of the blow- 

 pipe. I remain, Sir, your obedient servant, 



N. J. Winch. 



XhMaclureite, or FluO'Silicale of Magnesia j' it nexu Mineral Species from 



Neio Jersey. 



This mineral was discovered, several years ago, near Sparta, in 

 Sussex County, New Jersey, by the late Dr. Bruce. It was at first 

 supposed to be splieue; but subsequent investigations led to its being 

 ranked with condrodiie, a mineral discovered in Sweden, and analyzed 

 by M. d'Ohsson, whose results, confirmed by Berzelius, were as 

 follows : 



Silica 38-00 



Magnesia 5400 



Oxide of iron . . ^ 5*1 



Alumina 1 "5 



Potassa 0-86 



Manganese Trace 



Loss 51? 



10000 



The iiew mineral, however, though it resembles condroditc in exter- 

 nal characters, differs essentially from it in chemical composition, as 

 was proved from an analysis, which appears to have been made with 

 care and skill, by Mr. Henry Scybert, of Philadelphia. 



Though the pulverized mineral gives no indication of fluoric acid, 

 when acted upon by an excess of heated sulphuric acid, and though 

 other processes failed to detect it, yet fluoric acid was distinctly traced 

 in the silica, remaining after the calcined mineral had been first 

 boiled with nitromuriatic acid (which converted it into a jelly), and 

 then heated with water acidulated with muriatic acid. The silica, thus 

 obtained, effervesced violently with sulphuric acid, and gave fluosilicic 

 acid in abundance, disengaged, it should appear, from the insoluble 

 compound of potassa, silica, and fluoric acid, described by Gay-Lussac 



