1880.] 
57 
[Nichols, 
about a mile and a half in length. For these latter figures, 
which are given in full in Table III, I am indebted to the City 
Engineer. These observations, as well as those of the U. S. Signal 
Service, are made in Fahrenheit degrees, but I have calculated 
them into the degrees of the centigrade scale. 
Table III. Observations made at the Pump- well of 
Mystic Water-works. 
[Temperature expressed in degrees centigrade.] 
Day of 
Month. 
1879. 
Oct. 
Nov. 
Dec. 
1880. 
Jan. 
Feb. 
March. 
April. 
May. 
1880. 
June. 
1 
10.6 
4.7 
2.2 
2.5 
2.8 
3.0 
10.0 
20.8 
2 
9.5 
4.7 
1.9 
2.2 
2.5 
3 0 
10.0 
21.1 
3 
9.5 
4.7 
1.9 
2.5 
2.5 
3.3 
10.0 
20.3 
4 
9.2 
4.7 
1.9 
2.2 
2.8 
3.3 
10.6 
20.3 
5 
8.1 
3.7 
2.2 
2.2 
3.3 
4.5 
13.3 
20.0 
6 
7.5 
5.7 
2.2 
1.7 
3.3 
6.1 
13.3 
20.0 
7 
7 2 
4.7 
2.2 
1.7 
3.9 
6.1 
13.6 
19.7 
8 
7.2 
5.0 
2.2 
1.7 
3.6 
5.3 
13.6 
19.7 
9 
6.9 
4.7 
2.2 
1.7 
3.3 
5.3 
13.9 
18.9 
10 
7.8 
4.5 
2.2 
1.7 
3.0 
5.3 
16.7 
18.6 
11 
8.1 
4.7 
2.2 
1.9 
3.3 
5.6 
16.4 
18.9 
12 
7.5 
5.0 
2.5 
1.7 
' 2.8 
5.6 
17.8 
18.9 
13 
8.3 
4.5 
2.5 
1.7 
2.5 
5.6 
17.5 
22.2 
14 
8.1 
4.5 
2.2 
1.7 
2.8 
6.1 
16.1 
22.5 
15 
8.3 
4.5 
2.2 
1.7 
2.8 
6.9 
15.6 
22.2 
16 
8.9 
4.2 
2.2 
1.4 
2.8 
7.2 
15.3 
22.2 
17 
8.6 
4.2 
2.2 
1.4 
2.5 
7.2 
15.3 
22.2 
18 
16.7 
8.6 
3.6 
2.2 
1.4 
2.2 
6.9 
16.1 
22.8 
19 
16.7 
8.1 
3.6 
2.5 
1.7 
2.8 
6.9 
16.1 
22.5 
20 
15.8 
7.8 
2.8 
2.2 
1.7 
2.8 
7.2 
15.6 
22.5 
21 
15.0 
6.7 
2.8 
2.2 
1.7 
2.8 
7.2 
17.5 
23.1 
22 
14.5 
6.1 
1.9 
2.2 
2.2 
2.8 
7.2 
17.8 
22.5 
23 
14.5 
6.1 
1.4 
2.2 
2.2 
3.0 
7.2 
17.8 
23.3 
24 
14.8 
5.6 
1.7 
2.5 
2.2 
3.3 
8.1 
18.9 
‘ 21.9 
25 
13.3 
5.6 
1.7 
2.5 
2.2 
3.0 
8.9 
20.6 
23.1 
26 
12.8 
5.3 
1.7 
2.5 
2.2 
2.5 
8.6 
21.7 
23.9 
27 
12.2 
5.3 
1.7 
2.8 
2.2 
2.5 
9.5 
23.1 
25.3 
28 
11.9 
5.3 
1.9 
2.5 
2.2 
2.5 
10.0 
23.3 
25.6 
29 
11.7 
5.3 
1.9 
2.5 
2.2 
2.5 
10.0 
23.1 
25.6 
30 
11.7 
4.7 
2.2 
2.5 
2.8 
9.5 
22.5 
25.6 
31 
11.1 
1.9 
2.5 
2.8 
20.8 
Method of Observation . — Generally a sample of water was 
taken, at the same time, for chemical examination, and in the case 
of Fresh Pond a (centigrade) chemical thermometer was inserted 
