266 Notice of some Recent [April 



and to those of our own country, but especially of the trans- 

 actions of the Royal Society of Edinburgh. The arrange- 

 ments, however, which have hitherto been made public, are 

 not suited to the chemical systems of this country, and it is 

 therefore, with pleasure that we inform our readers, that 

 a system of Mineralogy, by Professor Thomson is in the 

 press, completely adapted to the present state of the science, 

 both as regards order and description. The following spe- 

 cies have lately been analyzed, principally on the continent: 

 1 . Graphite — A beautiful specimen of this mineral from 

 Ceylon, found in Gneiss in small pieces about the size of a 

 nut yielded : {Edinburgh Journal, and Journ. der Chem. 

 oV Erdmann, 1833.) 



100-0 

 {Ann. des Mines, vi.) 

 2. Hydro-boracite. — Resembles gypsum, spec. grav. 1*9. 

 Before the blowpipe melts into a transparent glass, which 

 does not change on cooling, and tinges the flame greenish. 

 The mineral is slightly soluble in water, and is readily dis- 

 solved by nitric and muriatic acids with the assistance of 

 heat. It contains 



Lime . . 13*298 1 atom 

 Magnesia . 10*430 2 " 

 Boracicacid 49*922 2 " 

 Water. . 26*330 3 " 



100*000 

 and its formula is (C + M) B 2 + 3 Aq. (Fogg. Ann.) 



