{ 167 ) 
III. An Account of an Experiment touching the dijfc^ 
rent 'Denjities of Lomynon Water^ jroyn the gveuteft 
degree of Heat in our Clwiate^ to the V retiring ^oint^ 
objcrVd by a Thermoyneter. By Mr, Fr. Haiiksbee, 
F. R. S. 
I Caus’d a Quart of Water to be heated near fcald- 
ing hot, and then put it into a convenient Glafs with 
my I'hermoiiieter, the Spirit in which fbon arofc into 
the Ball a-top, where it remain’d till the Water coolino- 
caiis’d it to defcend : by this time the Spirit in the Ther^ 
mometcr and the Water were become of an equal Tem- 
perature; and when it had deicended to 150 Degrees a- 
bove the Freezing Point, I began my Obfervations ; 
which take as follows. I weighed a linall Bottle in’t, 
and found the Bulk of Water equal to it in that State 
was 574 Grains. When the Spirit had deicended to 
80 Degrees above the Freezing Point, the Bulk of Wa- 
ter equal to the Bottle then weigh’d three quarters of a 
Grain more than before. At thirty Degrees above the 
Freezing Point, the quantity of Water equal to the Bulk 
of the Bottle was again increafed about three quarters 
of a Grain. At the Freezing Point, it weigh’d Bill fome- 
thing more ; in all about two Grains from 1 50 Degrees 
above the Freezing Point, to that very Point. Which 
to me ieems confiderable, and ought to be taken notice 
of by fuch Gentlemen, who judge of a Mineral or any 
other Water by its weight, when they have not an op- 
portunity of making the Experiment at the Fountain- 
head ; for there I fuppofe the Water is at the fame Ds- 
'gree of Temperature at all Seafons. 
No^y 
