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It appears from the interesting communication to the Royal Society, June 19th, by Messrs. De La Rue, Stewart, and Loewy, that the difference of the area of spots on the visible northern and southern quarter-spheres of the sun seems, during periods of considerable solar disturbance, to obey a law such that the difference is a maximum in the same quarter-sphere during several successive rotations of the sun, the difference being a maximum alternately in the northern and southern hemispheres—the time from maximum to maximum, for the same hemisphere, being variable between 18 and 32 days, but having a mean value of about 25-2 days. It occurs at once that if the variations of the mean terrestrial magnetic force are connected in any way with the solar spots, or the causes which produce them, we might here find some explanation of the magnetic period of 26 days, the difference of spot-area in one hemisphere from that in the other being related to a difference of the solar magnetic action.

I. On the period of hemispherical excess of sun-spots, and the 26-day period of terrestrial magnetism