W. A. Norton on Molecular Physics. 197 
equator to the ecliptic (about 7°); or suppose the equator and 
ecliptic to coincide. It appears, therefore, that the poles of all 
the permanent currents should coincide with the poles of 
rotation. : 
But it is important to observe that at every moment of time 
there will be, coéxisting with the permanent currents, a system 
fore, there will be a secondary magnetic equator, crossing the eclip- 
tic in 163° and 348° of longitude, and a secondary magnetic pole, 
Origin of the Sun’s Spots—The systematic observations upon 
conclusively to establish that the sun’s spots have their im- 
mediate origin in some action of the planets Jupiter, Saturn, 
te e 2 
1173, 1181, 1185, 1228, 1234, 1270, 1289, 1294, 1855, 1526, &e. 
Pro f has determined the epochs of maxima of the sun's 
spots for a period comprising 100 years; and fin omer: the 
Period of the spots varies from 8 to 16 years, and that its mean 
Value is 11:15 years. He gives a formula for determining the 
‘Spot-condition of the sun at different dates, 1n which the several 
t the specific actions of the four planets Just men- 
