(439) 
IJF. Frnther Expetiments about Freei,ing. By 
Mr. Deimafters Communicated by £)r, MuT- 
grave. 
IN the Account given t^umh. 24^. p. 384. concern- 
ing the Expaofion of Water by Freezing, rhe Water 
then made ufe of in thefe Tryals, was, a (ort of rough 
Pump- Water ; which, according to what Tryals have 
been made with it, does, Bpon the effufion of Oyl of Tar- 
tar per deliquium^ immediately turn milky and turbid : 
and confidering the Ice made of this Water was a fort of 
very rarefied white Ice, I was thereby inclined to try 
whether River Water, which would readily mix with 
Oyl of Tartar without the leaft precipitation, would 
upon freezing be expanded to the height of the Pump- 
Water, above-mentioned.; 
In order to which, I filled a Glafs Tube, of almoft an 
Inch Diameter, with River- Water to the height of Six 
Inches (as I had done in the former Try al) , and putting 
it to freeze in a Mixture of Snow and Salt, it gained but 
{ of an Inch after it was frozen, whereas the Pump-Wa» 
ter got \ of an Inch. 
I obferved that while the River- Water was freezings 
Bubbles rofe from the bottom of the Tube much at the 
fame rate as in the freezing of Pump-Water. 
I likewife took boyled Pump- Water, and having filled 
a Tube with it to the height of Six Inches, and fet it to 
freeze as before, it rofe hardly to J of an Inch above the 
Mark ; when as the fame Water un-boy I'd rofe J. 
IV. An 
