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into an apparent mountain. Such apparent moun- 
tains formed from trees, put on all forms and fhapes, 
as doping, perpendicular, overleaning ; but foon re- 
cover their natural appearance, when the Sun is pad: 
by them, or got above the horizon. 
14. Mountains themfelves, at a didance, fome- 
times appear larger than at other times. Beads and 
cattle in the midd of, and being furrounded with, 
water, appear nearer to us, than when no water fur- 
rounds them. Cattle, houfes, trees, all objects on 
the fummit of a hill, when feen through a fog, and 
at a proper didance, appear enlarged. All bodies 
admit of larger apparent magnitudes, when feen 
through fotne mediums, than others. 
But more particularly, 
15. I took a cylindrical glafs vedel, about two feet 
high, and having graduated its fides to inches, I 
placed it upright on a table, with a piece of paper 
under the bottom of the glafs, on which paper were 
drawn parallel right lines, at a proper didance from 
each other ; and having placed a fhilling at the bottom 
of the vedel, it was nearly as low as the paper. Pour- 
ing water into the vedel, and viewing the fhilling 
through the medium of water, with one eye, whild 
I beheld w r ith the other eye, where the edges of the 
fhilling were projected on the paper, and its parallels, 
I found the fhilling appear larger, at every additional 
inch depth of the water ; and this was the cafe, if 
either eye was ufed ; and the fame, when the eye was 
removed far from the furface, or near to it, or in any 
pofition thereto. 
16. I took large veflels, filled them with water,, 
placed different bodies at the bottoms of thofe veflels. 
It 
