pass through each other, and yet be never the wiser as to each other's
existence. Mr. Crookes gives us a glimpse of the possibility of such
unconscious co-existence of intelligent beings, and but a very slight
effort of imagination is needed to realise the conception.

It is not improbable that other sentient beings have organs
of sense which do not respond to some or any of the rays to
which our eyes are sensitive, but are able to appreciate
other vibrations to which we are blind. Such beings would
practically be living in a different world to our own.
Imagine, for instance, what idea we should form of
surrounding objects were we endowed with eyes not sensitive
to the ordinary rays of light, but sensitive to the
vibrations concerned in electric and magnetic phenomena.
Glass and crystal would be among the most opaque of bodies.
Metals would be more or less transparent, and a telegraph
wire through the air would look like a long narrow hole
drilled through an impervious solid body. A dynamo in active
work would resemble a conflagration, whilst a permanent
magnet would realise the dream of mediæval mystics, and
become an everlasting lamp with no expenditure of energy or
consumption of fuel.[18]

Kâmaloka is a region peopled by intelligent and semi-intelligent
entities, just as our own is thus peopled; it is crowded, like our
world, with many types and forms of living things, as diverse from
each other as a blade of grass is different from a tiger, a tiger from
a man. It interpenetrates our own world and is interpenetrated by it,
but, as the states of matter in the two worlds differ, they co-exist
without the knowledge of the intelligent beings in either. Only under