PHYSICAL avy LITERARY, 29 
image of the illuminating body by ree 
flexion, like a piece of polifhed filver: But, 
as it is confiderably rough and unequal, 
* ei 
forface: If a body be immerfed which attraés the fluid, 
and is therefore furrounded likeways with a concave ele- 
wation of the fluid; as foon as the two elevations begin 
to join, the body will move towards the fide of the vel- 
fel with an accelerated motion. Cafe 2. Suppofe a fluid 
which is formed into a convex furface, either by the re- 
pulfive power of the containing vetlel or cohefive force 
of its own particles : if a light body be immerfed which 
attraéts the fluid; as foon as its furrounding elevation 
begins to join with the lateral depreflion of the fluid, it 
will begin to move towards the middle of the veflel ; and, 
it it be brought by force towards the fide, it will recede 
from it again witb an accelerated motion, 
In both the firft and fecond ca/es, if the attra@ing bo- 
dy be held faft, and the whole fluid made eafily move- 
able with its containing veffel, it will remove to or from 
the attracting body in the fame manner as the attracting 
body did with refpec to it; ze. in the firk cafe, the 
whole fluid will move fo that the attracting body may 
come to its edge; and, in the fecond, fo that it may re- 
cede from it. Ca/e 3. If, in-a fluid which is attracted 
by the fides of its veffel, a body be immerted which re- 
pels the fluid, and is therefore furrounded with a ditch 
or convex depreffion of the fluid; as foon as that depref- 
fion begins to join the elevation of the fluid at the fides, 
it will recede towards the middle; and, if forcibly 
brought to the fide of the veffel, will fly trom it with 
: aa 
