We have already alluded to the lateral vortices of the terral system. We
must now resort to a diagram.
In the following figure, the arrows represent the ethereal current of
the terral vortex; the linear circle, the earth; C the centre of gravity
of the earth and moon, and, consequently, the central vortex or axis of
the vortex of the earth, I represents the position of the inner vortex,
and O that of the outer vortex. These two last are eddies, caused by the
obstacle presented by the earth in being _pushed_ out from the centre by
the moon, and are called lateral vortices. There are, therefore, two
lateral vortices, and one central, in both hemispheres, and by this
simple arrangement is the earth watered, and the atmospheric circulation
produced.
[Illustration: Fig. 3]