“You are aware⁠—or probably, in this half-educated age, you are not aware⁠—that the country round some parts of the Amazon is still only partially explored, and that a great number of tributaries, some of them entirely uncharted, run into the main river. It was my business to visit this little-known back-country and to examine its fauna, which furnished me with the materials for several chapters for that great and monumental work upon zoology which will be my life’s justification. I was returning, my work accomplished, when I had occasion to spend a night at a small Indian village at a point where a certain tributary⁠—the name and position of which I withhold⁠—opens into the main river. The natives were Cucama Indians, an amiable but degraded race, with mental powers hardly superior to the average Londoner. I had effected some cures among them upon my way up the river, and had impressed them considerably with my personality, so that I was not surprised to find myself eagerly awaited upon my return. I gathered from their signs that someone had urgent need of my medical services, and I followed the chief to one of his huts. When I entered I found that the sufferer to whose aid I had been summoned had that instant expired.