Experiments 071 the Fufton of Platina. 473 



" wide, therefore at leaft one inch wider than in 

 " Mr. Willis's experiment, and gave it as o-reat 

 " a heat as I could well produce for near 

 " two hours in my nielting furnace : at the end 

 " of which time I found the platina only agglu- 

 " tinated. The fire in this experiment appeared 

 " to have been according to Mr. Wedgwood's 

 <* clay-pieces in feveral parts of the crucible from 

 " 165° to 175* of his pyrometer. The fpecific 

 " gravity, taken by Mr. Moore in the prefence 

 " of Mr. Willis, Mr. Henry, junior, and myfelf, 

 *^ was 15.4.2." , ,.^-.., 



E X P E R I M E $f^ VIII. 



Mr. Henry, junior, a young chemift of great 

 promife, brought to me a piece of the coalefced 

 mafs, mentioned above in Dr. Pearfon's remarks, 

 and I melted iiperfe upon a bed of charcoal in two 

 hours, in a degree of heat of 140 to 150 of Mr. 

 Wedgwood's pyrometer, but in a fmaller cruci- 

 ble than the dodor ufed. Dr. Pearfon took this 

 fufed piece and expofed it to the heat of a forge 

 upon a thick plate of hammered iron, and in a 

 white heat it became evidently in a beginning 

 ftate of fufion, in which ftate upon the hot anvil 

 it was flattened by the hammer, but cracked like 

 caft iron. 



The doftor fent the other moiety of the five 

 hundred grains that were agglutinated, mentioned 

 under experiment feventh, and defired me to try 



to 



