52 Dr. B. F. Harrison on Solution of Ice on Inland Waters. 
Ata depth: of 3 ft, 36°, at. 6.4: 37% 
“ 9 ft. 373°, “12 ft. 38° 
“ «“ iF ft. 38°, “18 ft. 38°. 
ne “9 th O05 “ 244 ft. (bottom) 40°. 
Mean temperature of the lake 37°°33. The mean temperature 
of the air since Dec. 17th, 26°°78. Amount of water fallen, 4° ser 
inches, of which there were 14 inches of pees snow. Rise 
mean temperature of the lake in 19 days, 2°-23, although the 
mean temperature of the air had been nearly eleven degrees 
lower than the temperature to which the lake attained. 
Jan. 23d, 1861, found the ice on the lake 16 or 17 inches thick. 
Temperature of water at the surface under the ice 31°°5. 
At 8 depth of ; 35°'5 at 6 ft, 38°33, 
“ 38°5, “ 12 ft, 38°5. 
3 #6 . fe 38°°5, “ 18 ft. 38°67, 
* in oe a “ 24 ft. 40°-5. 
= ©; 25 ft, 406 
Mean temperature of ths lake 37°-95.* Mean temperature of 
the air since Jan. 5th, 22°88. Amount of water fallen during 
the interval, 2:19 pas dg including the water from wl inches of 
snow. Rise in the mean temperature of the Jake, 1°-7. 
Feb. Ist, 1861. Thickness of the ice not noted. Temperature 
at the surface of the water under the ice 38°. 
At a depth of 3 ft. 345, at 6 ft. 38°°5. 
= “Of, OF, “19h. Se76, 
: > 16 fh: 89%, “ 18 ft. 39°25. 
2 * OL ft, 40%, “ 24 ft. 40°25. 
Mean temperature 4 ae a 88°. Mean temperature of the 
atmosphere since Jan °-9. Rise in mean temperature 0 
the lake in 9 days, 0° 6. sates fallen, 1°29 inches, part of 
which was from 8 inches of snow melt 
Feb. 27, 1861. Ice 9 inches thick. Temperature of surface 
water 35°. 
At a depth of 3 ft 40°°5, at 6 ft. 41°. 
9 ft. 41°5, “ 12 ft. 41°66. 
3 “ 15 ft. 41°66, * 18 ft, 41°66. 
a 21 ft. 41°66, * 2a. 40°76. 
s * 27 t. 40°65. 
Mean temperature of ys lake 40°-8. Rise in temperature of 
the lake since Feb. 1st, 2°°8. Water fallen, 2°9 inches—no 
snow an temperature of the air for the same period, 31° “48, 
but for the last half of the period the mean temperature ‘was 85 
temperature of the spat air at this time was 15°, which probably dimin- 
ialots, the he observed temperature at the surface. If we call the surface temperature 
32° the mean will be $8°, 
(EES ES ARIS Et RE an OR NE OE ae TERS Eh el Se ata ae REN TD iy, ign ed Seay oT ae 
