“You may take it, young man, that I am versed in the elements of my business.  This is not a conceivable bone either of a tapir or of any other creature known to zoology.  It belongs to a very large, a very strong, and, by all analogy, a very fierce animal which exists upon the face of the earth, but has not yet come under the notice of science.  You are still unconvinced?”

“I am at least deeply interested.”

“Then your case is not hopeless.  I feel that there is reason lurking in you somewhere, so we will patiently grope round for it.  We will now leave the dead American and proceed with my narrative.  You can imagine that I could hardly come away from the Amazon without probing deeper into the matter.  There were indications as to the direction from which the dead traveler had come.  Indian legends would alone have been my guide, for I found that rumors of a strange land were common among all the riverine tribes.  You have heard, no doubt, of Curupuri?”

“Never.”

“Curupuri is the spirit of the woods, something terrible, something malevolent, something to be avoided.  None can describe its shape or nature, but it is a word of terror along the Amazon.  Now all tribes agree as to the direction in which Curupuri lives.  It was the same direction from which the American had come.  Something terrible lay that way.  It was my business to find out what it was.”

“What did you do?” My flippancy was all gone.  This massive man compelled one’s attention and respect.

“I overcame the extreme reluctance of the natives—­a reluctance which extends even to talk upon the subject—­and by judicious persuasion and gifts, aided, I will admit, by some threats of coercion, I got two of them to act as guides.  After many adventures which I need not describe, and after traveling a distance which I will not mention, in a direction which I withhold, we came at last to a tract of country which has never been described, nor, indeed, visited save by my unfortunate predecessor.  Would you kindly look at this?”

He handed me a photograph—­half-plate size.

“The unsatisfactory appearance of it is due to the fact,” said he, “that on descending the river the boat was upset and the case which contained the undeveloped films was broken, with disastrous results.  Nearly all of them were totally ruined—­an irreparable loss.  This is one of the few which partially escaped.  This explanation of deficiencies or abnormalities you will kindly accept.  There was talk of faking.  I am not in a mood to argue such a point.”

The photograph was certainly very off-colored.  An unkind critic might easily have misinterpreted that dim surface.  It was a dull gray landscape, and as I gradually deciphered the details of it I realized that it represented a long and enormously high line of cliffs exactly like an immense cataract seen in the distance, with a sloping, tree-clad plain in the foreground.