292 ON THE COMBINATIONS OF 
thermometer were used in every experiment. 
As it was impossible to pour the whole of either 
liquid out of the bottle, preparatory trials were, 
in every instance, made, previously to making 
the experiments, as to how much of the liquids 
adhered to the bottle after pouring, and as much 
as was thereby found to adhere, was used in ad- 
dition to the quantities stated in the experiments, 
as a compensation. 
It will be observed that in the first experiment 
the temperature resulting from making the mix- 
ture, was greater when the vitriol was added to 
the water than when the water was added to the 
vitriol, and that in the second and third the 
reverse was the case; while in the fourth there 
was no apparent difference. ‘These facts must 
be owing to there being a greater facility of sud- 
denly effecting the mixture in one case than 
another, by pouring the vitriol into the water 
(and then stirring,) or vice versd. 
The results of the experiments show that the 
highest temperature is produced in the same 
instance which Dr. Thomson found it to be pro- 
duced in, viz., when one atom of oil of vitriol 
and two atoms of water are mixed: but, it will 
not be right, without further inquiry, therefrom 
