It concerns the engineer of the steam-launch belonging to the Maranon cattle estate of the B. O. S. Co., Ltd.  This estate is also an island—­an island as big as a small province, lying in the estuary of a great South American river.  It is wild and not beautiful, but the grass growing on its low plains seems to possess exceptionally nourishing and flavouring qualities.  It resounds with the lowing of innumerable herds—­a deep and distressing sound under the open sky, rising like a monstrous protest of prisoners condemned to death.  On the mainland, across twenty miles of discoloured muddy water, there stands a city whose name, let us say, is Horta.

But the most interesting characteristic of this island (which seems like a sort of penal settlement for condemned cattle) consists in its being the only known habitat of an extremely rare and gorgeous butterfly.  The species is even more rare than it is beautiful, which is not saying little.  I have already alluded to my travels.  I travelled at that time, but strictly for myself and with a moderation unknown in our days of round-the-world tickets.  I even travelled with a purpose.  As a matter of fact, I am—­“Ha, ha, ha!—­a desperate butterfly-slayer.  Ha, ha, ha!”

This was the tone in which Mr. Harry Gee, the manager of the cattle station, alluded to my pursuits.  He seemed to consider me the greatest absurdity in the world.  On the other hand, the B. O. S. Co., Ltd., represented to him the acme of the nineteenth century’s achievement.  I believe that he slept in his leggings and spurs.  His days he spent in the saddle flying over the plains, followed by a train of half-wild horsemen, who called him Don Enrique, and who had no definite idea of the B. O. S. Co., Ltd., which paid their wages.  He was an excellent manager, but I don’t see why, when we met at meals, he should have thumped me on the back, with loud, derisive inquiries:  “How’s the deadly sport to-day?  Butterflies going strong?  Ha, ha, ha!”—­especially as he charged me two dollars per diem for the hospitality of the B. O. S. Co., Ltd., (capital L1,500,000, fully paid up), in whose balance-sheet for that year those monies are no doubt included.  “I don’t think I can make it anything less in justice to my company,” he had remarked, with extreme gravity, when I was arranging with him the terms of my stay on the island.

His chaff would have been harmless enough if intimacy of intercourse in the absence of all friendly feeling were not a thing detestable in itself.  Moreover, his facetiousness was not very amusing.  It consisted in the wearisome repetition of descriptive phrases applied to people with a burst of laughter.  “Desperate butterfly-slayer.  Ha, ha, ha!” was one sample of his peculiar wit which he himself enjoyed so much.  And in the same vein of exquisite humour he called my attention to the engineer of the steam-launch, one day, as we strolled on the path by the side of the creek.