, [ 2 5 ^ ] 
union lefs perfedf betwixt that and the tallow, and 
not by the prefence of any acid ; I impregnated a 
frefh parcel cf the fame diflilled water with fixed 
air, which had palled through half a yard of a wide 
barometer tube filled with fait of tartar ; but this 
water caufed the fame curdling with foap as the former 
had done, and appeared in every refpedt to be exadfly 
the fame. 
Experiment IX. 
Diddled water faturated with fixed air formed a 
white cloud and precipitation, upon being mixed 
with a folution of J'accbarum faturni. I found like- 
wife, that fixed air, after palling through the tube 
filled with alkaline fait, upon being let into a phial 
containing a folution of the metallic fait in diftilled 
water, caufed a perfect feparation of the lead, in form 
of a white powder; for the water, after this precipi- 
tation, (hewed no cloudinefs upon a frefh mixture of 
the fubftances which had before rendered it opaque. 
A Letter 
