Dr Turner on Lithion-Mica. 



261 



Found the chronometer nearly right on making the land. 



Art. X. — On Lithion-Mica. By Edward Turner, M. D. 

 F. R. S.E. Lecturer on Chemistry, and Fellow of the Royal 

 College of Physicians, Edinburgh. Communicated by the 

 Author. 



In the last Number of this Journal, I gave the analysis of a 

 mica from Cornwall, which was supposed, from its action be- 

 fore the blow-pipe, to contain lithia ; and it was there stated, 

 that several similar micas had fallen under my notice, with 

 the investigation of which I was at that time engaged. Hav- 

 ing possessed an active assistant in my friend and pupil Mr 

 William Gregory, I have been able to complete the analysis 

 of three lithion-micas, besides repeating the former one, 

 which I subsequently found reason to suspect of slight in- 

 accuracy. Of these different analyses I shall now give a de- 

 scription ; but before speaking of each individually, it will be 



