T H K 

 LONDON, EDINBURGH and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



T~B R A 



[SIXTH 8BRIES.1/Z v /?' 



// J^ 



JANUAR Y 1914. 



^C^' ^ ° F F ' G ^ 

 I. The Temperature of Sublimation. By J. Joly, F.R.S* 



IN the Philosophical Magazine For Jane 1913 I gave an 

 account of experiments on the temperatures at which 

 various sublimates are evolved from mineral substances. The 

 sublimate ^Yas obtained by heating the powdered mineral on 

 a platinum ribbon enclosed between watch-glasses, the ap- 

 proximate temperature of sublimation being ascertained in 

 terms of the current heating the ribbon. The apparatus, 

 which I have called the Apophorometer, is described in the 

 Phil. Mag. for Feb. 1913. 



Subsequently to the publication of my experiments on the 

 temperature of sublimation, I received samples of several rare 

 minerals through the kindness of the Trustees of the British 

 Museum, of the Custodians of the Museum of Geology, 

 Jermyn Street, and of the Oxford Museum. I have 

 specially to thank, in connexion with these valuable con- 

 tributions, Mr. G. Prior, Dr. H. H. Teall, and Professor 

 Sollas. A few additional specimens were purchased. The 

 object of this paper is to give an account of the results 

 obtained on these specimens, in continuation of the results 

 already published. 



Antimony. 



In my former paper a table of results on antimony-bearing 

 substances appears. It contains 20 experiments on sub- 

 stances containing the molecule Sb 2 S 3 and 5 on substances 

 containing the antimony differently combined. Considering 

 the former class of compounds first, the conclusion arrived 



* Communicated by the Author. 

 Phil. Mag. S. 6. Vol. 27. No. 157. Jan. 1914. B 



