50 Dr. B. F, Harrison on Solution of Ice on Inland Waters. 
five feet deep, situated in latitude a little less than 424° N., on 
the borders of New Haven an lesex counties, in the state 
of Conneciicut, On the north Be east the lake is sheltered by 
trap hills rising abruptly to the height of two or three hundred 
feet, and on the south and west there are long rolling hills of no 
great elevation, so that the south and so uthwest winds alone 
sweep unimpeded over its surface. The surface drained by the 
lake is small, probably not exceeding twice its own surface— 
there are some small springs and little streams flowing into it, 
but probably none of them are sixty rods in length. These cir- 
cumstances render the lake entirely exempt from those influences 
which are exerted by large HORS streams, and which also lead 
to an annual change of level of 16 or 18 inches. The lake has 
an outlet through get a small stream flows except in some 
of the eer seaso 
Sept. 3, 1859, I as the temperature of the water at the sur- 
face oF the lake 71° F. Nov. 2d it was 48°F. Dee, 81st, 1899, 
I visited the lake again and learned that it had been co vered 
with ice since Dec. 5th. I found the ice at the time of this visit 
pretty uniformly . coo thick. I selected two stations, one 5 
ore, the other near the centre of the lake 
and observed the beaiunaniare at different depths as shown in 
the following table. 
Temperature of water 5 or 6 rods from shore. Station near centre of the lake. 
Dee. 31, 1859. , | Depth below surfe Temperature,|| Below the surface. |Temperature. 
Ice 7 in. thick. a 
ong beraperetane Under the ice, 33° F, Under theice. | 33° F. 
aters of 6 feet. 84° 6 feet. 88° 
the lake 35°) fs ee 84° saa 84° 
determined fi +t Ee! 38° 185 6% 874° 
the most reliable 25: -% 394° 
Jan. 23, 1860, ice 10) 
or ll in, thick. §} Under the ice. 34° Under the ice. | 344° 
Mean temperature 3 feet. 38° 8 feet. 37° 
of the lake from Ss * 39° Sane 884° 
the most reliable 13 ¢ 40° sy a 394° 
f these experi- eae’ 40° 16.% 40° 
ments, 389-7 giv- 23 “bottom, 42° % * 414° 
ing a rise since 25 “bottom. 434° 
Dee. 31st of 3°.6. 
Feb 15, 1860, ice 14 
Jror is'in. thick. § Under the ice. | 334° Under the ice. | 33° 
‘Mean temperature 8 feet. 41° 6 feet. 40° 
of the water 18:44 41° 1s * 404° 
ak betie.aipliot is: -“ 414° 18 “ 414° 
z = — in 23.# 42° 24 “ 42° 
mperat for, 
q the last 23 98 days 
a OOE 
The mean temperature of the atmosphere from Dee. 31st, 1869, 
to Jan. 23d, 1860, was 26°°3. The fall of water for the same 
a eS A ee 
