47 6 Experiments on the Fufion of Platina. 



was converted into a white enamel, but in the 

 lower part of the crucible, the bone alhes were 

 only a fpongy mafs. 



EXPERIMENT XL 



I difiblved half an ounce of platina in twenty- 

 four ounces of aqua regia and obtained a folution 

 by digeftion in heat. A precipitate was made 

 by a faturated folution of fal ammoniac, which 

 precipitate, when dried, weighed half an ounce. 

 This was put on a bed of charcoal in a crucible, 

 and in half an hour's time, it was cracked, and 

 all the precipitate was loft in the fire. 



EXPERIMENT XII. 



One ounce of platina was hruifedy and diflblved 

 more readily than in the former experiment in 

 twenty-eight ounces of aqua regia. This folu- 

 tion was precipitated with a folution of fal 

 ammoniac, and after drying the precipitate I 

 took one fourth part of it and added half a pint 

 of water, and ftirred them well with a ftick, and 

 then faturated it with dry volatile alkali. The 

 liquor was filtrated from it, and the powder, 

 being dried, was put on a bed of charcoal pow- 

 der, and expofed for two hours to the fire as in 

 the former experiments. I obtained only thirty- 

 one grains of fufed platina : fifteen of which 

 were in five larger globules, the remainder in 



very fmall ones. 



EXPERI- 



