C 646 ] 
PAPER II. 
Kead jane 20 »*T"'HE more obvious properties of this 
‘/34- A extraordinary mineral, and its ha- 
bitus to fire, hngly, and in conjundtion with the va- 
rious fubftances call’d by the chemifts fluxes , made 
the objedl of the firft paper. In this, it is propos’d to 
examine the eftedl of acid fpirits, iimple and com- 
pound, applied after various manners ; in order to 
determine not only its relation or habitus to them, but 
likewife its lefs obvious agreement or difagreement 
with the metallic bodies, whofe hiftory is more 
known. 
The platina employ’d in the following experiments 
was previoufly freed from its line dull by a fieve ; 
from the mercury, by ignition ; and from the golden 
and fome of the other heterogeneous particles, by the 
eye affifted with glaiTes. 
Experiment 1 . 
Platina with the Vitriolic Acid. 
1. Several parcels of platina were digefted for fome 
hours, in a gentle heat, with fpirit of vitriol, both 
concentrated, and diluted with different proportions 
of water. No folution happen’d, nor any fenfible 
alteration, either in the liquors or the platina. 
2 . Three ounces of well-dephlegmated fpirit of 
vitriol were boil’d with one ounce of platina, in a 
tall, narrow-neck’d glafs, for fome hours. The liquor 
remain’d neatly of the fame quantity as at firft ; and 
no 
