278 | Miscellaneous Intelligence. 
The stream of water is cooled to the freezing point, and by the cold 
of the night its temperature is still more reduced. In this state the 
onion is more than Brine ae and the stenes and wood under the 
ind the ice a vine them. 
_ The quantity of anchor-ice formed would be small for an obvious 
reason. Every pound of water frozen would evolve 142° of caloric, 
which would raise 142 pounds of water one degree, or 71 pounds two 
degrees. Allowing the temperature of the stream to be reduced to 
31° or 30°, the ee of a relatively = quantity would thus 
» 
& 
"2 
B 
= 
is) 
tae 
a 
a 
> 
tas) 
n 
S. 
oe 
im 
1] 
= 
Oo 
n 
id 
$s) 
D 
= 
i=) 
° 
a 
a 
i ) 
wD 
ae 
ue 
because they sites aia the same ines sinha as the water. 
Rochester, July, 1 
P. S. Rocks sometimes pass from a frozen me ae: oo with 
which their temperature may be as low as 20°, and under water, 
which congeals on them because they are so cold, noe thus ford s solid 
‘~ have never seen it in solid masses, but of a spongy appearance. 
the anchor-ice retains after it has risen to the surface of the water. 
P Discovery of the Great Lake ** Ngami,” of South Af ca ; (Let- 
a. from the Rev. David Livingston, addressed to the, Rev.” 
o, main nat Poreipth Secretary, London Missionary Society ; dated, 
the. River Zonga, 3rd September, 1849; cited from Jameson’s Jour- 
Ju , 1850, vol. ie Ke 156.)- —Dear Sir,—I left my station, Ko 
Sh ear on: the Ist of June last, 
. ee formed you, viz., too 
ees 
‘great obstacle to our progress, cae the 
' nort » has hitherto present ted an 
thirty waggons, ate many @ 
Two gel eaitoeipns, to: whon I had communicated my faten tion: of pr: 
ceeding to the. ofi-reported lake beyond the desert, came me from m Englan¢ 
for the ¢ pul thee oa present at the disc nd ta 
3 e0;0pe we are Sonepe ya 
objects have been 
