Slow Signal Fade ebooks

I hesitated at first at this conclusion, but in
reflecting that the tide was known to be perceptible at Obydos,
more than 400 miles from the sea, that at high water in the dry
season a large flood from the Amazons enters the mouth of the
Tapajos, and that there is but a very small difference of level
between that point and the Cupari, a fact shown by the absence of
current in the dry season. I could have no doubt that this
conclusion was a correct one.
The fact of the tide being felt 530 miles up the Amazons, passing
from the main stream to one of its affluents 380 miles from its
mouth, and thence to a branch in the third degree, is a proof of
the extreme flatness of the land which forms the lower part of
the Amazonian valley. This uniformity of level is shown also in
the broad lake-like expanses of water formed near their mouths by
the principal affluents which cross the valley to join the main
river.
August 21st.--John Aracu consented to accompany me to the falls
with one of his men to hunt and fish for me.


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