I 256 ] 



union lefs perfect betwixt that and the tallow, and 

 net by the prefence of any acid ; I impregnated a 

 frefh parcel of the fame diftilled 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 refpeel: to be exactly 

 the fame. 



Experiment IX. 



Diftilled water iaturated with fixed air formed a 

 white cloud and precipitation, upon being mixed 

 with a folution of faccbarum faturnu I found like- 

 wife, that fixed air, after puffing 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 ieparation of the lead, in form 

 of a white powder; tor the water, after this precipi- 

 tation, fhewed no cloudinefs upon a frefh mixture of 

 the iubftances which had before rendered it opaque. 



A Letter 



