W. A. Norton on Molecular Physics. 63 
ties of the crust of the earth to be the same at all points, it is 
plain that every such pole will coincide with the geographical 
pole; since the annual resultants would be coincident with the 
ed. These may be called ecliptic currents. The currents 
due to the earth’s rotation alone will be of a similar character, 
and follow circles parallel to the equator. These two sets of 
currents, especially the former, play the prominent part in origin- 
ing a ini 
eee amiuar ones, 
it should be added that the more permanent magnetic forces 
devel the currents above considered may consist, in a 
this Journal, vol. iy, p. theory of the magnetic action of 
th on a citaas 5 aay based upon the funda- — 
Mental assumption that “every particle of matter at the earth’s 
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