where leaves a gap to jump over--he
argued that if such elements did not exist they ought to, and so he
calculated what these elements ought to be like, giving their atomic
weight, chemical affinities, and the like; and when they were discovered
many years later they were found to answer exactly to his description.
He prophesied, not by guesswork, but by knowledge of the Law; and in
much the same way radium was discovered by Professor and Madame Curie.
In like manner Hertz was led to the discovery of the electro-magnetic
waves. The celebrated mathematician Clerk-Maxwell had calculated all
particulars of these waves twenty-five years before Hertz, on the basis
of these calculations, worked out his discovery. Again, Neptune, the
outermost known planet of our system was discovered by the astronomer
Galle in consequence of calculations made by Leverrier. Certain
variations in the movements of the planets were mathematically
unaccountable except on the hypothesis that some more remote planet
existed. Astronomers had faith in mathematics and the hypothetical
planet was found to be a reality. Instances of this kind might be
multiplied, but as the French say "a quoi bon?" I think these will be
sufficient to convince the reader that the invariable sequence of Law is
a factor to be relied upon, and that by studying its working under known
conditions we may get at least some measure of light on conditions which
are as yet unknown to us.

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