Analyses of Phlogopite. 383 
The writer cannot close this paper ibis beige his thanks 
to numerous correspondents who have in the.-kindest man ner 
responded to his persevering enquiries “for spore ens. It is in- 
een of those who wish to examine them 
. ies : 
so labelled as to avoid.error, and they are.at all times open to the 
Laboratory 
_ Read before the American a paneer for the oe of Science, at "jes 
n, August, 18 
Tu mica called Phlogopite has been ened by oa 
dorff, in Poggendorff’s Annalen, volume viii, page 157. gin 
| analysis has likewise been published by Svanberg, in the 
- actions of the Royal Swedish Academy for 1839, of a miga 
which has been supposed to be phlogopite, but as it does not 
agree in atomic proportions with that ong New York, it my 
probably may not come under this s 
Meitzendorff gives the following as the ‘composition of the 
Specimen which he analyzed: it was from Jefferson Co., N. Y.; 
3 and probably from Natal Bridge 
Nadsomeli Fl i 
ae seat ea oti & O65 $80 02810114 
- Oxygen, 2146 «= 717 «053 «1131 =—-1'65 017 
The specimens ee by me were all from Edwards, St. 
Lawrence Co., N.Y. No. 1, had a deep yellonemns brown color, 
in broad plates. 
many exam 
that the Aaa ? and da Line 
: Yale College, Oe cae vansin alaerars ia 
. ¥ Traité de Minéralogie, iii, p. 647, 1847, also Danssfp 359. 
Fad 
Ans, XXXVIII.— Analyses of Phlogopite from St. Tera a | 
County, N. Y.; by Wm. me of the Yale Sieh ; 
m a 
