.11, An Experiment touching tie Free::s^ng of Com* 
mon Water^ .and Water Tur£dof Air, By Mr, Fr, 
HauksbeC) S. 
“Ills Experiment was recommended to me, in or- 
_ der to difcoVer what difference would happen in 
the Swelling or Bulk of Ice, producible on the Freezing of 
Common Water, and Water Purg’d of Air. 
Accordingly 1 procur’d a couple of Glaffes, in 
form of the Figure in the Margin. Thefe, 
when Fil’d with the different Waters to a de- 
terminate height,’ fuppofing at itj I con- 
vey’d into the Freezing Mixture, (which 
was nothing elfe but a Compofition of Snow 
and Bay-Salt po'wder’d pretty finej where 
they did not remain above three or four Mi- 
nutes of time, before the Congelation began 
in each of them, which was very difcernible, 
by the Afcent of the Water in their refpe£Hve 
Tubes, above their firft Heights and in 
about an Hours time, it- had afcended in that 
• Glafs, which contain’d the Water purg’d of 
Air, at leaft 6 Inches ; but in the other Glafs with 
common Water, not fo much by more -than an Inch ; 
thei'e being fuch a Difparity in the Content of tjie two 
Glalfes, the lafl mention’d being lefs by a fifth part than 
the other, which contain’d not lull four Ounces. It was 
obfervable, that during the Glaffes continuance in the 
Frigotifick Mixtu-re, fmall Bubbles of Air did continual- 
ly afcend in that which was fill’d wfith Common Water, 
but 
