150 Analyses by Prof. Gmclin of Tubingen. 



siderable height; and die old red sandstone formation is 

 finely exemplified in the hills of Chunar and Mirzapore. The 

 subject of geological research is comparatively new in India, 

 and we therefore hail with feelings of real gratification any 

 attempt to make us better acquainted with the structure of a 

 country whose features and external configuration differ so 

 widely* from our own. We trust the Society, in its physical 

 character, will often have to number among its contributors 

 such zealous and able observers of nature as the author of the 

 paper of which we have now given a slight outline. The 

 funds of the Society, it is gratifying to remark, are in a very 

 flourishing state, and the institution altogether has hitherto 

 prospered beyond the most sanguine expectation of its found- 

 ers. — hid. Gaz. 



ANALYSES BY PROF. GMELIN OF TUBINGEN. 



Essonite or cinnamonstone of Ceylon: sp.gr. 3*617, at 

 76° Fahr. 



Silica 40-006 



Alumina 22-996 



Lime 30-573 



Peroxide of iron . . 3*666 



Potash 0-589 . 



Volatile matter . . . 0-326 

 A trace of manganese 



98-156- 

 Pinite of St. Pardoux in Auvergne: sp. gr. 27575, at 

 47° Fahr. 



Silica 55-964 



Alumina 25*480 



Potash 7-894 



Soda 0-386 



Peroxide of iron 5*512 



Magnesia and oxide of manganese 3 - 760 

 Water, with animal matter . . 1*410 



100*406 

 Prof. Gmelin states that this mineral, when heated in a 

 glass phial, emits water having an empyreumatic odour, which 

 instantly restores the blue colour to reddened litmus, and there- 

 fore contains ammonia. He thinks this alkali probably results 

 from the decomposition of some animal matter contained in 

 the pinite ; and remarks that this mineral is never found in 

 fresh rocks, but always, as in Auvergne, for example, in a de- 

 composed granite, upon which the volcanic rocks of that pro- 

 vince rest. He has also discovered a considerable propor- 

 tion 



