1880.] 
T3 
[Nichols. 
In concluding this paper, I may say that, while I hope to make 
further observations on the ponds of this neighborhood during 
the next year, and eventually on larger bodies of water, I trust 
that observations may he made by others, especially with refer- 
ence to the cooling of water from the temperature of greatest 
density, and to the changes in temperature after the ice has 
formed. 
Table VII. Hourly Observations made on Chestnut Hill 
Reservoir, Boston Water Works, by D. Fitzgerald, C.E. 
Time. 1875. 
Temper 
in Fab 
At 
the 
surface. 
ature (e? 
irenheit c 
16 feet 
from 
surface. 
:pressed 
[egrees) 
At 
bottom 
(24 ft.) 
Temper 
cent 
At 
the 
surface. 
ature (expr 
igrade degr 
16 feet 
from 
surface. 
essed in 
ees) 
At 
bottom 
(24 ft.) 
Sept. 1, 9.15 
A.M. 
72 
70 
66 
22.2 
21.1 
18.9 
10 
U 
73 
71 
66 
2 2. 8 
21.7 
18.9 
11 
u 
74 
72 
66 
23.3 
22.2 
18.9 
12 
M. 
75 
72 
66 
23.9 
22.2 
18.9 
1.10 
P.M. 
75 
72 
67 
23.9 
22.2 
19.4 
2.5 
<( 
75 
71 
69 
23.9 
21.7 
20.6 
3 
« 
75 
71 
69 
23.9 
21.7 
20.6 
4 
u 
75 
73 
70 
23.9 
22.8 
21.1 
5 
« 
75 
72 
69 
23.9 
22.2 
20.6 
6 
u 
75 
72 
69 
23.9 
22.2 
20.6 
7.10 
u 
73 
71 
69 
22.8 
21.7 
20.6 
8 
a 
74 
72 
68 
23.3 
22.2 
20.0 
9 
« 
73 
72 
69 
22.8 
22.2 
20.6 
10 
« 
73 
72 
70 
22.8 
22.2 
21.1 
11 
u 
73 
72 
69 
22.8 
22.2 
20.6 
12 
u 
73 
72 
68 
22.8 
22.2 
20.0 
Sept. 2, 1 
A.M. 
73 
72 
69 
22.8 
22.2 
20.6 
2 
u 
73 
72 
70 
22.8 
22.2 
21,1 
3 
u 
72 
72 
70 . 
22.2 
22.2 
21.1 
4 
u 
72 
72 
71 
22.2 
22.2 
21.7 
The following list contains such papers on the temperatures of lakes 
and ponds as have come to the notice of the author, together with indi- 
cations, in some instances, of the observations recorded. In the present 
multitude of societies and serial publications, it would be very difficult 
to make such a list complete. No mention is made of observations on 
rivers, or of papers on the subject of ground-ice, and a few unpublished 
series of observations are referred to. All the titles and references have 
been personally verified, except those designated by a f. 
