598 



June 10. 

 SIR Wm. R. HAMILTON, LL. D., President, in the Chair. 



Charles Hanlon, Esq., Maxwell M'Master, Esq., Thomas 

 Oldham, Esq., Philip Read, Esq., Henry Roe, Esq., and 

 Robert Wilson, Esq., were elected Members of the Aca- 

 demy. 



Dr. Apjohn read an account of the constitution of 

 Jade, and also of two ores of Manganese from the South of 

 Cork. 



Dr. Apjohn observed that these minerals had been re- 

 cently analysed in his laboratory, and as the results were 

 somewhat novel, he thought he might mention them to the 

 Academy ; his principal object being that they might appear 

 in the Proceedings, for the information of mineralogists and 

 chemists. 



The Jade submitted to analysis was wrought into orna- 

 ments of various kinds, which were brought to Europe by 

 Captain Baddeley, who was engaged in several of the opera- 

 tions of the recent Chinese war. Its colour is white, with a 

 tinge of yellowish green. It has a splintery fracture, and is 

 highly translucent. S.G. = 2, 965. Hardness over 7, or be- 

 tween rock crystal and topaz. Alone before the blowpipe 

 it glazes, but with great difficulty, on the surface. 



By exposure to a strong red heat, it gives off a little 

 water, and becomes opake. Fluxed in the usual manner 

 with carbonate of barytes, it was found to include no al- 

 kali. Another portion of it fused with a mixture of the car- 

 bonates of potash and soda, yielded the following quantitative 

 results : 



