3T[0 Scientific Intelligence, * 



8. Meliing point of Silver and its alloys with Gold, — Mr Prinsep of Be- 

 nares, in a very able paper on the measurement of high temperatures, has 

 given the following average results, which are of great importance :— 



Full red heat, - - ^200° Fahr. 



Orange heat, - - 1650 



Silver melting, - - 1830 



Silver with one-tenth gold, 1920 



Silver with one- tenth gold, 2050 



Mr Wedgewood made the melting point of silver so high as 471?° and 

 Mr Daniell 2233°. 



III. NATURAL HISTOEY. 



MINERALOGY. 



9. Specimen of Chalcedony with a large Fluid Cavity. — A foreign dealer 

 in minerals has sent us a drawing of a very curious specimen of common 

 blue chalcedony, having in it a cavity half full of a " limpid fluid not un- 

 like to water." The specimen has been ground and polished all round the 

 cavity, so as to leave a crust of chalcedony about one-tenth of an inch 

 thick. The external dimensions of the specimen are two inches long by 

 one inch broad, so that the length of the cavity is at least one inch and se- 

 ven-tenths. The price asked for this specimen is thirty guineas. If the 

 fluid is water, it is not worth the tenth part of that sum ; but if it is, 

 which is not probable, one of the new fluids discovered in topaz, the spe- 

 cimen would be invaluable. 



10. Analysis of Radiolite. By Professor Hunefeld. 



