94 
I think, already been made with regard to the connexion 
between sun-spots and rainfall. 
2. To test this I have taken the heights of the rivers Elbe 
and Seine as recorded by Professor Fritz, and I am indebted 
to the kindness of Professor Archibald for bringing the me- 
moir of Professor Fritz before me. There is a long series of 
heights for both these rivers, these heights being expressed 
in metres above a certain mark. 
These heights have been arranged according to the sun-spot 
cycle after the following method. The dates of the various 
maxima of sun-spots, as given by Professor Wolf in his most 
recent memoir, are taken as the starting points, or 0 and 
each interval between successive maxima is divided into 12 
equal parts called 1, 2, 3, 4, ... . 11, 0, no further regard 
being had to the inequalities in the lengths of the various 
periods. The river heights corresponding to the dates of 
these various subdivisions have been obtained from Profes- 
sor Fritz’s results by a simple interpolation. 
3. This method will be easily understood by reference to 
the following tables. 
Table 1 * 
HEIGHT OF THE ELBE. 
Period commencing with maximum 
0*5 
1‘5 
2-5 
3-5 
4-5 
5-5 
6-5 
7-5 
8-5 
9-5 
10-5 
11 *6 
1727*5 
219 
2-55 
2-81 
2-79 
2*67 
2*74 
2-31 
2-87 
2*84 
2-78 
3*14 
2-97 
1738-7 
3-06 
3-04 
3-00 
2-89 
2-78 
2-74 
3-10 
3-01 
2-45 
2-82 
3-06 
2-88 
1750-3 
2-64 
2“62 
2-39 
2-57 
2-65 
2-90 
2-89 
2-74 
2*44 
2-28 
2-57 
2-66 
1761*5 
2-52 
2-50 
2-53 
2-84 
2-95 
2-62 
2-45 
2-45 
2-60 
2-60 
2-76 
3*19 
1769-7 
3-60 
3*77 
3-67 
3-02 
2-64 
2-60 
2-83 
2-83 
2-67 
2-57 
2-80 
2-83 
1778-4 
2-65 
2-42 
2-61 
3-19 
2*82 
2-68 
2-82 
2*17 
2-54 
2-75 
2-62 
2-33 
1788-1 
2-49 
2-47 
1-97 
2-10 
1-72 
2-14 
2-24 
2-31 
2-55 
1-84 
2-22 
2-30 
1804-2 
2-92 
2*95 
2-60 
2-28 
2-04 
1-88 
1-63 
1-83 
2'15 
1-82 
1-78 
2-06 
1816-4 
2-21 
1-86 
1-98 
1*82 
2-26 
1-85 
1-76 
2-13 
1-89 
2-00 
2-34 
2-44 
1829-9 
2-41 
2*46 
2-42 
1-85 
1-69 
1*94 
1-89 
1*74 
1-44 
1-35 
1-47 
1-87 
1837'2 
2*24. 
2*20 
2-33 
1-91 
1'98 
1-58 
1-91 
2-34 
2-21 
1-99 
2-04 
2-04 
1848-1 
1-67 
1-88 
2-35 
2-34 
2-02 
2-10 
2*22 
2-32 
1-84 
1-45 
1-57 
1-62 
* It 
was 
intended to make the 
recorded numbers correspond to 
the 
divisions 0, 1, 2, &c., but by an accident it was the above intervals which 
were recorded. This does not affect the result obtained. 
