In the north frigid or temperate zone, he has to lie with his head
northward; in the southern, southward; in the torrid zone, eastward--
in order that the magnetic current may pass through him from head to
foot without disturbance, as this is the natural position for
magnetization.
The following diagram may give a clearer view of the case, and thus help
us to answer the second part of the question, whether and when we ought
to lie on the right or the left side, on the stomach or on the back:--
[[Diagram here]]
The able writer of "How Shall we Sleep?" shows, in his cross diagram,
that he thinks the head to be entirely positive and both feet negative.
I think that this is not the case, but that the right side of the head
and the left foot are positive, and the left side of the head and the
right foot negative, and similarly the right hand is negative and the
left hand is positive.
As the north pole is positive and the left side of the head negative,
the natural position in sleep for those living within the northern zones
would be on the right side, head northward; and it is obvious that in
the southern zones the position must be exactly the reverse.
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