74 
periments, from which I leave it 
to you to draw conclufions., I in- 
tend to purfue them again this win- 
ter; and, if yon can fuggeft any 
ideas on the fubject, that can reach 
Canada before March 1786, I fhall 
be glad to avail myfelf of them. 
Ep. WILLIAMS, 
Remarks on the preceding Exirad, 
éy Cha. Hutton, LL. D. 
From thefe ingenious experi- 
ments, we may draw feveral con- 
clufions. As, 
Firft, We hence obferve the a- 
mazing force of the expanfion of 
sthe ice, or the water, in the att of 
freezing ; which is {fuilicient to 
overcome perhaps any refiltance 
whatever; and the confequence 
feems to be, either that the water 
will freeze, and, by expanding, 
burft the containing body, be it 
ever fo thick and {trong ; or elfe, 
if the refiftance of the containing 
body exceed the expanfive force of 
the ice, or of water in the adt of 
freezing, then, by preventing the 
expanfion, it will prevent the freez- 
ing, and the water will remain fiuid, 
whatever the degree of cold may 
be. 
The amazing force of congela- 
tion is alfo obvious from the dif- 
tance to which the iron plugs were 
projected. For, if we confider the 
very fmall time that the force of 
expanfion aéts on the plug in pufh- 
ing it out, and that the plug, of 
2ilb. weight, was projected with 
a velocity of more than zo feet in 
a fecond of time, and thrown to the 
diftance of 415 feet by this force ; 
fo acting, the intenfity of the force 
will appear to be truly aftonifh- 
ing. 
“ 2dly, We may hence form an 
ANNUAL REGISTER, 1790. 
eftimate of the quantity which the 
water expands by freezing. For 
the longeft cylinder of ice was ob-_ 
ferved to be 8 inches without the 
hole; to this add 13, the thicknefg 7 
of the metal, or length of the hole, 
and the fum, or 10 inches, isthe ¥ 
whole length of the cylinder of ice, 
the diameter of which is 1, inches; 7 
and hence its folid content is- 
1.77 X10 X.7854 cubic inches. 
But the diameter of the {pherical © 
cavity, filled with water, is 935 © 
inches; and therefore 9.13x2x. 4 
7854 is the content of the water in — 
cubic inches. 
Hence then the content of the ~ 
water is to the increafe by expan- | 
lion, as 3 of g.13 to 10 times 1.77, 
or as 502.4 to 28.9, or as 174,to | 
10. So that the water, in this in- 
ftance, expanded in freezing, by a — 
quantity which is between the 17th © 
and 18th part of itfelf. 
C,H. 
Cafe of a Patient who difcharged the f 
Pupea of the Mufca Cibaria. By 
W. White, M.D. and F.R.S. 7 
With Obfervations by J. Church, ~ 
A.M. From Memoirs of the Me- ~ 
dical Scctety of London, vol. it. 
/ 4 
WATSON, aged about 30 © 
e years, by trade a watchmaker, © 
iober and temperate, but indulging 
a fedentary life, having been fome ~ 
time ill, came over here to put him- © 
felf under my care. I found him 
much emaciated, his complexion — 
very yellow, he had violent pains 
with forenefs and tenfion about the © 
region of the liver, his body very © 
coftive, ftools clayey and tenacious, — 
urine in {mail quantity and high- 
coloured, pulfe quick and tenfe, he — 
had frequent rigors, and other 
fymptoms — 
