92 Dr. Thomas Thomson on the [Feb. 



remarkable that on the same day, and at the same hour, 

 France lost the immortal author of the Mecanique Celeste. 



The remains of Volta were carried to the tomb with great 

 respect. The professors, the friends of science, the inha- 

 bitants of the town and neighbourhood, accompanied the 

 body of this wise philosopher, of this virtuous father, of 

 this charitable citizen, to its last home. The handsome 

 monument which has been raised to his memory, near the 

 picturesque village of Camnago, is a striking proof of the 

 sincerity of their sorrow. 



The place of Foreign Associate, which was left vacant 

 by the death of Volta, was filled by Dr. Thomas Young. 

 Scientific bodies are fortunate, when in recruiting, they 

 can thus make genius' succeed to genius. 



1 Article II. 



Chemical Analysis of Thulite. By Thomas Thomson, M. D., 

 F. R. S., L. and E. &c, Regius Professor of Chemistry 

 in the University of Glasgow. 



This mineral has been known for about twelve years ; 

 but I am not aware that any mineralogical description of 

 it, or chemical analysis of it has been published, either in 

 this country or on the continent. I got a specimen of it 

 last summer, from Dr. Bondi of Dresden. It bears so 

 striking a resemblance to bisilicate of manganese, that I 

 had no doubt before examining it, that I would find its 

 constitution similar to the composition of that mineral. 

 The blow-pipe indicated merely a trace of manganese, so 

 small that it was not worth while to attempt to separate it. 

 But I found abundance of peroxide of cerium, which I did 

 not expect. It contains also lime, potash, and peroxide 

 of iron, all seemingly in combination with silica. It consti- 

 tutes, therefore, a new and not uninteresting species of 

 cerium minerals, hitherto rather few in number. I con- 

 ceive, therefore, that a short account of its mineralogical 

 characters, and of its chemical analysis, will be acceptable 

 to the mineralogists and chemists of this country. 



The locality of Thulite is Souland in Tellemark, Norway. 

 The mass of my specimen is white granular quartz, through 



