In the first place,” went on Professor ChallengerLoading..., “you are probably aware that two years ago I made a journey to South America — one which will be classical in the scientific history of the world? The object of my journey was to verify some conclusions of Wallace and of Bates, which could only be done by observing their reported facts under the same conditions in which they had themselves noted them. If my expedition had no other results it would still have been noteworthy, but a curious incident occurred to me while there which opened up an entirely fresh line of inquiry.