Let us now pass on to the human subject and consider a few examples of
what is usually called the psychic side of our nature. Walt Whitman was
quite right when he said that we are not all included between our hat
and our boots; we shall find that our modes of consciousness and powers
of action are not entirely restricted to our physical body. The
importance of this line of enquiry lies in the fact that if we do
possess extra-physical powers, these also form part of our personality
and must be included in our estimate of our relation to our environment,
and it is therefore worth our while to consider them.

Some very interesting experiments have been made by De Rochas, an
eminent French scientist, which go to show that under certain magnetic
conditions the sensation of physical touch can be experienced at some
distance from the body. He found that under these conditions the person
experimented on is insensible to the prick of a needle run into his
skin, but if the prick is made about an inch-and-a-half away from the
surface of the skin he feels it. Again at about three inches from this
point he feels the prick of the needle, but is insensible to it in the
space between these two points. Then there comes another interval in
which no sensation is conveyed, but at about three inches still further
away he again feels the sensation, and so on; so that he appears to be
surrounded by successive zones of sensation, the first about an
inch-and-a-half from the body, and the others at intervals of about
three inches each. The number of these zones seems to vary in different
cases, but in some there are as many as six or seven, thus giving a
radius of sensation, extending to more than twenty inches beyond the
body.

Now to explain this we must have recourse to what I have already said