The series of incidents set forth in this little volume represent either the most elaborate and ingenious hoax ever played upon the public, or else they constitute an event in human history which may in the future appear to have been epoch-making in its character. It is hard for the mind to grasp what the ultimate results may be if we have actually proved the existence upon the surface of this planet of a population which may be as numerous as the human race, which pursues its own strange life in its own strange way, and which is only separated from ourselves by some difference of vibrations.