ACROSS UNKNOWN SOUTH AMERICA 
We felt the heat considerably going down the river, 
as we were always in the sun in the centre of the stream, 
with a temperature seldom less than 105° Fahrenheit. 
Especially where thick forest was on both sides of us, there 
seemed to be no air close to the water; but when we came 
to patches of chapada and open country we could breathe 
a little better. Several were the tributary streamlets to 
which we came that afternoon. First we saw one rivulet, 
one metre wide, on the right bank, then 13 kilometres 500 
metres farther on another affluent, three metres wide, 
coming from the northeast, also on the right bank; then 
1,500 metres farther a rivulet one-half metre wide, com¬ 
ing from the southwest (left bank) ; then 4,500 metres 
farther a charming stream, six metres wide, coming from 
the north, and meeting with the Arinos near an extensive 
stony place with shallow and troublesome water. Strong 
eddies formed at that spot. One more streamlet, one 
metre wide, was reached that day on the right. It came 
from the northeast. 
The river had that day flowed almost continuously in 
directions varying from northwest to north, barring two 
sections where its course had been 10° east of north. 
After passing the last tributary the river described a 
sweeping curve, gradually turning so far back as to flow 
in a southwesterly (240° bearings magnetic) direction. 
There was shallow water with gravel banks in the 
centre of the stream. Curiously enough, we did not no¬ 
tice so much rubber close to the river in that region, but 
in an excursion a short distance from the water we came 
upon Siphonia elastica trees, not only along the Arinos 
but also along the tributaries. 
We halted that day at sunset, having gone 73 kilo¬ 
metres 400 metres; which, although much less than the 
previous days, was still fair going for us. 
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