480 Experiments on the Fujion of Platina, 



there was a perfedl fufion. It was not malleable, 



and when broken, was coarfe grained and 



had no apparent cavity. The fpecific gravity 

 was only 12.3. 



EXPERIMENT XVII. 



One ounce of platina was mixed with only 

 two drachms of glafs phofphorus, but after two 

 hours of very ftrong heat, there was only an 

 agglutination. The mafs was afterwards bruifed 

 and put into a crucible, with a little charcoal 

 at bottom, and a complete fufion was eflFe(fled 

 in two hours. This was not more malleable 

 than the laft, and on breaking it, it was finer 

 grained than that in the lafl experiment, but 

 the fpecific gravity was only 13.89; although 

 there were no cavities difcovered. 



There were five different forts of platina in 

 grains ufed in thefe experiments, one of Mr. 

 Nowell's, two forts of Dr. Pearfon's, and two 

 of my own. 



EXPERIMENT XVIII. 



As the platina ufed after the fourteenth ex- 

 periment was different from that of my own 

 ufed before, and the fifteenth not being fuc- 

 cefsful, I repeated the latter with the fame 

 platina as ufed in thofe experiments, and in 

 two hours fufed it. It had a fmooth furface, 

 and when broken had no cavities 3 the fpecific 



gravity 



