APPENDIX. 357 
as to be fo much more fpecifically lighter 
than Water, as to be able to buoy them up 
with it. And when it freezes to a confider- 
able Thicknefs, it will raife up with it from 
the Bottom, the Fifhermens Ofier Wheels 
which are funk down with Stones or Bricks 
tied to them to catch Fifli. 
3. T)ec, 28, 1731. At eight a Clock in the 
Morning, the Spirit in the Thermometer be- 
ing then i 2 +t Degrees below the freezing 
Point, I found the fame Bay frozen over in 
like manner, both on the Surface and at the 
Bottom, as far as to the Edge of the quick 
Stream, where it was not frozen either at 
the Bottom or on the Top, its Motion being 
too brisk: And accordingly the Watermen 
and Fifhermen obferve, that it freeZeth foon- 
efl: at the Bottom where the Stream is moft 
gentle ; and the fame may be obferved as to 
the Surface of a Pond, which will be frozen 
over fooner, in that part on which a gentle 
North-Eaft Wind blows, than where it is 
more expofed to a ftronger Wind. 
4. Though Snow in frofty Weather haft- 
ens the freezing of Water, yet it is obferved 
that the Thames freezes firil at the Bottom 
alfo when no Snow has fallen long before. 
A a 3 So 
