gulf stream of equal magnitude. On
the western side of the Indian Ocean we find a gathering of the N. E.
trades from the Bay of Bengal and the Indian Ocean, in which form and
travel the hurricanes which prevail--traveling to the southward and
westward--about the Isle of France or Mauritius; and the lagullus oceanic
current, which runs down to the S. W. toward the Cape of Good Hope. But
the extension of South America to the eastward, under, or just south of
the N. E. trades, does not permit the formation of such a concentrated
volume on the western side of the Atlantic, nor is the strength or
regularity of the N. E. trades, on that ocean, equal to those of the S. E.

Nor is the magnetic intensity on the eastern and middle portions of the
Pacific, sufficient to produce such a concentration, in large volume,
there. The trades over that ocean, therefore, curve without concentration,
except a partial one, over the western groups of Polynesia, which the
Asiatic line of magnetic intensity approaches and where hurricanes are
sometimes found, until we arrive near the eastern line of magnetic
intensity, on the eastern side of Asia. We shall, hereafter, have occasion
to follow the anomalous concentrated volumes of the S. E. counter-trade,
of the northern tropic, on the western side of the great oceans, in
explanation of some of the phenomena which we find north of the trade-wind
region. Suffice it here to add, that if it were not for the concentration
of these counter-trades, on the western side of the great oceans, the
rainless region between the parallels of 20 deg. and 30 deg. would encircle the
earth; and China and the Eastern United States would have a distinctly
marked rainy and dry season, as have California, the Barbary States,
Syria, Persia, and other countries which lie north of the rainless region,
within the summer range of the N. E. trades, but also within the winter
descending range of the belt of extra-tropical rains.

Another anomaly which we find in the trade-wind region, is the monsoon.
There are several of them, but they are found, in the greatest strength
and regularity, in the Indian Ocean. Another, defined by the
investigations of Maury, is found on the west coast of Africa, extending
out over the Atlantic. Another prevails on the western coast of South and
Central America. The etesian winds of the Mediterranean are but the N. E.
trades, whose northern limit is carried up in summer, by the transit of
the con