In these basins, but especially in the basin of the Amazon, and thence
in most places northward to the Caribbean Sea, lie the most extensive
stretches of tropical forest to be found anywhere. The forests of
tropical West Africa, and of portions of the Farther-Indian region,
are the only ones that can be compared with them. Much difficulty has
been experienced in exploring these forests, because under the
torrential rains and steaming heat the rank growth of vegetation
becomes almost impenetrable, and the streams difficult of navigation;
while white men suffer much from the terrible insect scourges and the
deadly diseases which modern science has discovered to be due very
largely to insect bites. The fauna and flora, however, are of great
interest. The American Museum was particularly anxious to obtain
collections from the divide between the headwaters of the Paraguay and
the Amazon, and from the southern affluents of the Amazon. Our purpose
was to ascend the Paraguay as nearly as possible to the head of
navigation, thence cross to the sources of one of the affluents of the
Amazon, and if possible descend it in canoes built on the spot. The
Paraguay is regularly navigated as high as boats can go. The starting-
point for our trip was to be Asuncion, in the state of Paraguay.
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