320 Intelligence atid Miscellaneous Articles. 



stalline mineral, which occurs three or four miles to the south of 

 Westchester, I'ennsylvania, and which incloses corundum and several 

 other mineral species. 



" The specimen was handed to him for examination by Mr. Nut- 

 tall several years since, and proving to be a silicate closely allied to 

 a felspar, he subjected it to analysis in conjunction with Prof. Booth, 

 in order to compare it with the several felspars previously investi- 

 gated by them. 



" It forms a white translucent mass composed of densely aggre- 

 gated crystalline grains, and might be mistaken, at the first glance, 

 for a moderately coarse-grained marble, did not its hardness indicate 

 a totally different substance. Its specific gravity is 2-612. 



" The analysis was performed in the manner mentioned in the 

 Proceedings of the Society for May 1841, and gave the following 

 results : — 



Oxygen. 



Silica 67-72 35-18 



Alumina with a trace of iron 20'54 9*593 ") 



Magnesia 034 0-131 "1 > 12-69 



Lime 0-78 0219 I „,^, 



Soda 10-65 2-724 ^"^"^"^ 



Potassa 0-16 0-027. 



100-19 



" This composition approaches nearest to that of albite, excepting 

 in a deficiency of silica, in which respect it resembles the albite from 

 the vicinity of Wilmington, otherwise corresponding to it closely in 

 composition ; and agrees also with an albitic felspar from Pennsyl- 

 vania, analysed by Redtenbacher in Prof. Rose's laboratory at Berlin 

 (Poggendorff's Annalen, vol. lii. p. 469), as shown by the following 

 comparative table. 



Six miles N.W. of Pennsylvania. Granular variety. 



Wilmington, Del. Locality not stated. Westchester, Pa. 



Albite. Booth and Boye. Redtenbacher. Booth and Boye. 



Silica 65-46 67-20 67-72 



Alumina 20-74 19-64 2054 



Sesquioxide of iron. . 0-54 . . a trace 



Magnesia 074 0-31 0-34 



Lime 0-71 1-44 0-78 



Soda 9-98 9-91 10 65 



Potassa 1-80 1-57 0-16 



99-97 100-07 100-19" 



ON A SERIES OF INSOLUBLE SALTS OF PHOSPHORIC ACID. 

 BY M. H. ROSE. 



When organic substances are carbonized without the contact of air, 

 and we then treat them with water till it ceases to dissolve anything, 

 hydrochloric acid often extracts from the charcoal exhausted by water, 

 a notable quantity of potash and soda and earthy phosphates ; the 



