five months in the valley of
Quito.

_Pebas Fossils_, p. 282.--In a letter to the author, Mr. Darwin says:
"Your discovery of marine shells high up the Amazon possesses _extreme_
interest, not only in itself, but as one more most striking instance how
rash it is to assert that any deposit is not a marine formation because
it does not contain fossils. As for myself, I never believed for a
moment in Agassiz's idea of the origin of the Amazonian formation."
Agassiz "candidly confesses (Lyell's _Principles_, i., 468) that he
failed to discover any of those proofs which we are accustomed to
regard, even in temperate latitudes, as essential for the establishment
of the former existence of glaciers where they are now no more. No
glaciated pebbles, or far-transported angular blocks with polished and
striated sides; no extensive surface of rock, smooth, and traversed by
rectilinear furrows, were observed." The fossiliferous bed at Pebas is
as plainly _in situ_ as the Medina sandstone at Genesee Falls.

_Tropical Flowers_, p. 292.--"During twelve years spent amid the
grandest tropical vegetation, I have seen nothing comparable to the
effect produced on our landscapes by gorse, broom, heather, wild
hyacinths, hawthorns, purple orchises, and buttercups."--Wallace's
_Malay Archipelago_.

_Coca-plant_, p. 293.--The engraving conveys the impression that the
leaves are parallel-veined; but the coca is a dicotyledon, with the
under surface of the leaf strongly marked with veins, of which two, in
addition to the midrib, run parallel with the margin.

_Pedrero_, Map.--This town on the Rio Negro is also written _Pedreira_.

INDEX.

Adobe dwellings, page 46.

Agassiz, Mount, 250.
Prof., on the geology of the Amazonian valley, 280, 282, 347.

Agriculture on the Amazon, 243.
Andes, 75.

Aground on the Amazon, 239.

Aguano, 201.

Aguardiente, 175.

Alcalde's house, 202.

Alligators, 35, 296.

Almeyrim Hills, 252.

Aloe, American, 100.

Alpargates, 70.

Altar, volcano of, 150.

Amazon River, annual rise, 274.
birds on, 306.
cetaceans, 299.
climate, 273, 284.
commerce, 277.
current, 273.
delta, 272.
depth, 274.
etymology, 278.
expeditions, 277.
first view of, 226.
fishes, 295.
foreign vessels on, 276.
insects, 300.
life within, 295.
magnitude, 264, 272, 278.
natural canals, 265.
navigation, 276.
reptiles, 296.
scene