[ 98 ] 
After an immerfion of 48 hours in the fait water, 
this flo^t (A) loft 1 6 grains of iis buoyant power; and 
having been 72 hours in the fait water, upon weigh- 
ing of it again out of the water, being wiped, but 
full of water, it was found to weigh 241 grains, 
having gained 30 grains. After being nine hours out 
of the water, in a dry room, it weighed 213 grains, 
having loft 28 grains. This float (A) having been 
76 hours in the fait water, in which it then fuflained 
949 grains of lead was removed, thus faturated 
with the fea water, into a veflel of frefti river water, 
and was found to fuftain 923 grains only, being 
26 grains lefs than it bore up in the fait water; and 
yet it muft be oblerved, that this float had been I'a- 
turated with frefli water before it was immerfed in 
the fait water. 
Experiments made to difeover the Specific Buoyancy oj 
Cork in Salt Water, 
Experiment V. 
Not content merely to know the buoyant power 
of cork in frefh water, it was next tried in fea water. 
Four cubes, being each an inch fquare on every fide, 
made of the beft found compadl cork, with diftind^ 
gages made of cork, and adjoining, as in the pre- 
ceding experiments, were prepared, each weighing 
as follows j 
Grains 
N° I 42 
2 42 .1 
3 54 
4 53 
5 43 
Amounting in all to 234 4 Crains. 
thefe 
