knowledge as definite, as certain, as familiar, as if he should travel to Africa in ordinary fashion, explore its deserts, and return to his own land the richer for the knowledge and experience gained.  A seasoned African explorer would care but little for the criticisms passed on his report by persons who had never been thither; he might tell what he saw, describe the animals whose habits he had studied, sketch the country he had traversed, sum up its products and its characteristics.  If he was contradicted, laughed at, set right, by untravelled critics, he would be neither ruffled nor distressed, but would merely leave them alone.  Ignorance cannot convince knowledge by repeated asseveration of its nescience.  The opinion of a hundred persons on a subject on which they are wholly ignorant is of no more weight than the opinion of one such person.  Evidence is strengthened by many consenting witnesses, testifying each to his knowledge of a fact, but nothing multiplied a thousand times remains nothing.  Strange, indeed, would it be if all the Space around us be empty, mere waste void, and the inhabitants of earth the only forms in which intelligence could clothe itself.  As Dr. Huxley said: 

Without stepping beyond the analogy of that which is known, it is easy to people the cosmos with entities, in ascending scale, until we reach something practically indistinguishable from omnipotence, omnipresence, and omniscience.[17]

If these entities did not have organs of sense like our own, if their senses responded to vibrations different from those which affect ours, they and we might walk side by side, pass each other, meet each other, 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 mediaeval mystics, and become an everlasting lamp with no expenditure of energy or consumption of fuel.[18]

Kamaloka is a region peopled by intelligent and semi-intelligent