Experiments on the Fuftm of Platina, 467 



covered with a hoar-froft, exhibits, as I have 

 lately remarked, beautiful brilliant points of 

 various colours, as, red, green, blue, &c. re- 

 fieded and refrafted at different angles ; which, 

 by attentive obfervation, might perhaps explain 

 the caufe both of the glory, and of the bright 

 arches above defcribed. 



Explanation of the Plate. 



CC. The white cloud. 

 AA. The fhining arches. 

 SS. The Ihadow. 

 GG. The glory. 



Experiments on the Fusion o/Platina ; hy Mr. 

 Thomas Willis, Chemiji, at the Hermitage, 

 London. Communicated by Mr. Thomas Henry 

 F.R.S. £fff. 



READ AUGUST I3, I789. 



TO Mr. THOMAS HENRY. 



gj_ LONDON, JULY 18, I789. 



I HEREWITH inclofe you a few experiments^ 

 on platina, and beg the favour of you to lay 

 them before your truly commendable fociety. 

 I Ihould have been happy could 1 have fucceeded 

 in rendering this extraordinary metal malleable, 

 H h 2 as 



