
Mineralogy and Geology. 273 
(2.) Yellow Scapolite from Bolton, Mass. This is a massive, pale 
yellowish variety. G.—=2°787. Analysis gave 
Bi Al Fe Ca Mg kK Na HH: Gad 
49-99 23°01 164 3°35 - 173 709 085 -4:23 7809919 
Here also the addition of potash is large, being 7-09 per cent., and the 
composition is near that of Potash mica. 
A Red Scapolite of Arendal, is next described. The analysis affords 
4:42 of potash and 4:31 of soda. A black scapolite from Arendal 
afforded no alkalies and a large amount of magnesia, showing a remo- 
val of soda and an addition of the magnesia. Another from the same 
locality, Arendal, has the constitution of epidote. 
[The yellow scapolite of Bolton is very similar in composition to the 
Algerite of Hunt, and sustains the view of Whitney that Algerite is a 
result of the alteration of Scapolite. It is a singular fact that Bolton 
alone has afforded to analysts the oxygen ratios for R, #, Si, as follows: 
Bipee tee Rie, 1: 80. 4 Ti See S26. £3 See. Ae 
a.wide variation of composition for a single locality, but readily expli- 
cable when the ease with which scapolite undergoes alteration from 
atmospheric agencies or infiltrating waters is considered.—1s. p. D. 
4. Report on the Salt and Gypsum of the Preston Salt Valley of the 
Holston River, Virginia; by Prof. H. D,,Rocers. Boston, 1854.— 
8000 feet. 
-Five productive wells are now in use in this, valley, bored to the 
moderate depth of 200 to.300 feet, and four inches diameter. In the 
