iles per hour.

MOUTH OF THE TIGREYACU RIVER.

Distance from the Atlantic, 2245 miles; current, 3-1/2 miles per hour;
average current between San Regis and the mouth of the Tigreyacu,
3-1/4 miles per hour. The Tigreyacu can be navigated by steamers of
considerable size for some distance; its waters are dark and clear,
and those tributaries of the Amazon having dark and clear waters are
usually unhealthy, whilst those having muddy and discolored waters
have always been found to be healthy.

SANTA CRUZ DE PARINARI.

Latitude, 4 deg. 36' 30" south; longitude 74 deg. 6' 30" west of
Greenwich; magnetic variation, 7 deg. 27' 20" east; thermometer, 78
deg.; elevation above sea-level, 351 feet; distance from the Atlantic,
2273 miles; current, 3-1/4 miles per hour.

PARANARI.

Distance from the Atlantic, 2293 miles; current, 3-1/4 miles per hour.

VACA MARINA.

Distance from the Atlantic, 2334 miles; current, 3-1/4 miles per hour.

ELVIRA.

Distance from the Atlantic, 2352 miles; current, 3-1/4 miles per hour.

SAN PEDRO.

Distance from the Atlantic, 2393 miles; current, 3-1/4 miles per
hour.

FONTEVERA.

Distance from the Atlantic, 2408 miles; current, 3-1/4 miles per hour.

MOUTH OF THE HUALLAGA RIVER.

Distance from the Atlantic, 2430 miles; current in Amazon, 3-1/4 miles
per hour. One hundred and twenty-three miles up the Huallaga is the
town of Yurimaguas, a centre of trade, to which steamers from Para
frequently ascend.

CEDRO ISLA.

Distant from the Atlantic 2445 miles; current, 3-1/4 miles per hour.

MOUTH OF THE PASTAGA RIVER.

Distance from the Atlantic, 2514 miles; current in the Amazon, 3-1/4
miles per hour. The Pastaga has a rapid current and is full of
obstructions to navigation; it is with much difficulty that canoes
even can be forced up the river for any distance. On its head waters
the Indians wash a considerable quantity of gold from the sand of the
bed of the channel.

BARRANCA.

Latitude, 4 deg. 59' 53" south; longitude, 76 deg. 38' 38" west of
Greenwich; magnetic variation, 7 deg. 46' 26" east; thermometer, 78
deg.; elevation above sea-level, 453 feet; distance from the Atlantic,
2545 miles; current, 3-1/4 miles per hour. Barranca is situated on a
red clay bluff, about seventy feet high, on the north or left bank of
the river, which is here narrow. Communication is kept up between
Barranca and Moyabamba by way of the Aypena river to its head and
thence b