49 
Table I. 
A 
Rainfall and Temperature. 
Year. 
Rainfall. 
Variation 
from gen’l 
average. 
Tempera¬ 
ture, 
Variation 
fr6m gen’l 
average. 
37.46 
—.84 
52.90 
2.25 
38.51 
.21 
50.11 
—.54 
35.76 
-2.54 
50.88 
.23 
40.93 
2.63 
47.07 
—3.58 
48.17 
9.87 
51.11 
.46 
43.04 
4.74 
50.86 
.21 
44.90 
6.60 
52.24 
2.59 
32.61 
—5.69 
49.15 
—1.50 
44.22 
5.92 
51.13 
.48 
38.49 
.19 
51.67 
1.02 
40.69 
2.39 
50.53 
— .12 
46.91 
8.61 
50.80 
.15 
38.26 
-.04 
49.66 
— .99 
34.83 
—3.47 
50.82 
.17 
31.13 
—7.17 
52.79 
2.14 
43.54 
5.24 
50.19 
— .46 
1856. 
31.89 
—6.41 
47.41 
-3.24 
32.22 
—6.08 
47.66 
—2.99 
48.49 
10.19 
50.40 
— .25 
32.81 
—5.49 
49.52 
1.13 
34.54 
—3.76 
52.90 
2.25 
1861... 
36.04 
—2.26 
50.97 
.32 
1862. 
46.30 
8.09 
49.63 
—1.02 
1868. 
34.36 
—3.94 
49.60 
—1.05 
33.96 
—4.34 
49.34 
—1.31 
42.11 
3.81 
50.83 
.18 
1866. 
37.29 
—1.01 
51.39 
.74 
1867. 
29.53 
—8.77 
52.35 
1.70 
1868. 
38.93 
.63 
51.66 
1.01 
1860. 
44.67 
6.37 
49.61 
— .74 
1870. 
29.90 
—8.40 
- 52.36 
1.71 
1871. 
32.86 
—5.44 
52.72 
2.07 
38.58 
.28 
50.16 
— .49 
1873. 
35.13 
—3.17 
50.19 
—.46 
1874. 
33.75 
—4.55 
52.37 
1.72 
1875. 
34.86 
—3.44 
48.36 
—2.29 
1876. 
45.66 
7.36 
50.65 
0.00 
1877. 
39.09 
.79 
52.76 
2.11 
flpnprfl! fl.vftrflP'f 1 
38.30 
50.65 
1 
In order to bring plainly before the eye the variations both of 
the rainfall and temperature in the different years, I have drawn 
curved lines as here shown; the dark line representing the rain¬ 
fall in inches, and the dotted line the temperature in degrees; the 
scale of each being marked at the left-hand margin. The rise or 
fall of the lines, from one perpendicular line to another as we 
move to the right, showing the increase or decrease in rain-fall and 
temperature from year to year, the years being marked at the top 
of the design. The general average of the annual rain-fall, 88.80 
inches, is shown by the heavy dark horizontal line. 
The points brought out by this graphic representation, to which I 
wish to call special attention, are as follows: 
First .—The fact that the rain-fall series appears to be divided 
into cycles of seven years each. For example, if we commence 
with the year 1844, which is considered above the general average, 
and count to the right by sevens, we shall find that each seventh 
year was also above this average, to-wit: 1851, 1858, 1865, 1872. 
—4 
