( 9^^ ) 
Water. This fcattering being made all at a time in many 
Places of the Walter in the Bafin ail round the Veffel of 
Glafs ; All the Particles which environ^ the VeiTel being 
at once prefs'd on ali fides were condenfed confiderably and 
fucceffively. The Veffel being in the Center of Preilion 
bore all the weight of this pre-:iion,as well as theLiquor which 
contained it. And this Liquor loft by its CondenCition very 
much of the motion of the Liquid, which it had before, 
which was confiderable enough to caufe rhe Liquor 
of the Thennometer to fall. This Cold goes oil quickly, 
becaule all the Water in the ^ifia being very much heated^ 
it quickly heats alfo that in the Veffel of Glafs. 
The ordinary Thermometers not being capable of mark- 
ing to me the Cold of the Water fo readily and nicely as- 
I would, in this Experiment^ I had recourfc to ar/other 
fort of Thermometer which was more exaft. This Ther- 
mometer is made of a Bowl of Glafs, A, wdiich has no other 
opening than that of a very long Tunnel, BC, which de- 
fcends almoft to the bottom ot the Bowl. One end of thc 
Tunnel is dipp'd in a Liquor E which is at the bottom of 
this Bowl, and the reft is filfd with nothing but Air, 
When the Air rarefies, it compreffes the Liquor which it 
forces to rife in the little Tunnel. And vv^hen it condenfes 
it gives the Liquor liberty to fall. This Thermometer is 
mofefenfible than any other, becaufe the Air which is its 
Mover, does rarefie v/ith Heat, and condenfes with Cold, 
fooner than any Liquid « 
As for the fenfible Heat of the Vapours which rife from ^^fl^^lf 
the Mixture -of Sal Armonlac with Oil of Vitriol 5 it is wol f r om the coU^^ 
difficult to find the Caufe, if we confider that thefe Vapours f^'^l^-!^!'^ 
are but the moft fubtil and aftive parts of this Mixture, ofsfiJrmnu^?^ 
which the fubtil Matter raifes with in it crofling it. The^«^^ 
Motion of thdh Particles is free in the Air ^ it is but more 
repreffed by the too grofs coagulated Particles. It becomes 
by fo much the more violent, by how much it has been 
retained and Hindred for fome time 5 and is perceived by 
Heat,which is the ordinaryEffed of rapid and violent mo- 
tion. I will 
