( P55 ) 
One ounce of Volatile Salt of Urine, in 5 ounces of 
Spirit of Vitriol, raifed a violent Ferment, during whkh 
the Liquor of the Thermometer defcended 7 inches 4 
lines. : 
The mixture of Salt of Tartar, or other fix'd Alkalous Fix^ds^^in 
pure Salts, with t\cid Liquors excited Fermentations \v4th^'!''''^'f''^ 
Meat' 
I made all thefe Experiments with the fame Thermome- 
ter, when the Weather was (ufficiently Cold, and the 
Temperature of the Air equal enough. 
, As- to the Reafon of thefe E}^perimentS5 I ^-^^^ c^f all ^'^4''^ofth-: 
ejcamined the fimpleCold Diffolutions, and having (with J^^^^^^^ 
all Phyficians) fixed this Principle, That Cold is nothing 
but the Diminution of motion 5 I fay, that the Coldnels 
which, the Salts bring to the Water, fecms to be occafion'd 
from this, that the Salt Particles being without motion, 
and dividing that Liquor, diminifties it fomuch the more. 
This fis that J which produces the Cold greater or left in 
the fame Liquor. 
There is one thing to be obferved, which is, that fome ^^^^/W- 
time after the Diffolution is made, the Liquor oftheTher- ^J^J^'X'nf n? 
mometer rifes again a litcle. Which ^ may be occafioned hit 1 971 being; _ 
by this, that the fubtil matter which glided abundantly 
between the Liquid Particles,, had ceas'd to glide there in 
the fame quantity for fome time, the grofs Particles of the 
Salts oppofing themfelves againft theirPaffage^ bucthele 
Saline Particles being divided by littfe and little, they o- 
pened again the pailages to the fubtil matter. This 
gave to the Liquor more Motion than it had at the begin- 
ning of the Diffolution ^ but yet lefs than it had whenk 
was pure and without mixture ^ the Saline Particles, alcho 
diflblv'd abating fomewhat of their motion. 
We may eafily comprehend why Lixivious Salts, purelv rr" . 
Alkalous and well Calcind, as alio the Salt of T:irr.'r Jc ^' 
Heat the Liquor, and are very far from Cooling h, ; ; 
Gonfider that thefe Salts iu the ftrong calcinadoii vv i 
