96 
5. The departures shown in the last columns of table III. 
are exhibited graphically in the diagram which accompanies 
this paper. It will be noticed that in each of the four 
curves there is a river maximum shortly after the maximum 
of sun-spots, and that there are also traces of a subsidiary 
maximum a good deal farther on, so that the curve gives 
indications of a double as well as of a single period. 
In conclusion I desire to express my thanks to Mr, Henry 
Stroud for assistance rendered in this investigation. 
