of delegating it to succeeding vacuums? Would
it not incline to rush in from the east and west where there are no
elevations, rather than from the S. W. and over the Kuenlun Mountains, the
intervening ridges and valleys of Thibet, the lofty Himmalayas, the extent
of India, and the Ghaut Mountains, from three to four thousand feet high,
on its eastern coast? Would it not, at least, _leak in a little_, and
lessen the force with which the vacuums would draw from the far-off Indian
Ocean, so that the monsoon could not blow with equal force? or, if Cobi
and its fellow deserts _must_ and _can_ draw from an _ocean_, why not from
the head of the Arabian Sea, or Bay of Bengal, or the China Sea, which are
nearer, or from the Japan Sea, which is still nearer, or the Yellow Sea,
which is close by? Why draw only from under the central belt of rains?
Nay, what shall be done with Professor Dove? In a recent article,
republished in the American Journal of Science and Art, for January, 1855,
he says: "A greatly diminished atmospheric pressure taking place in summer
over the _whole continent_ of Asia must produce an influx from all
surrounding parts; and thus we have west winds in Europe, north winds in
the Icy Sea, east winds on the east coast of Asia, and south winds in
India. _The monsoon itself becomes, as we see, in this point of view, only
a secondary phenomena._" This looks very like _antagonism_. Who shall we
believe?

Again, suppose you get one atmosphere from the whole area, raised up by
the supposed ascensive force, and at the rate of twenty-five, twenty, or
even ten miles an hour, and a new volume drawn in from the south-west,
and _over the mountains_: will it not take a _little time_ for _that_ to
_heat up_? Does it heat so fast as to _keep up the ascensive force_
without intermission, at twenty-five, or twenty, or ten miles the hour?
What says Mr. Ericsson to this? Can he not arrange with a moderate lens,
to move his engine with the rays of the summer sun? Nay, Lieutenant Maury
says they can not heat up "_per saltum_, or in a day." But according to a
reasonable calculation, they must heat up the air from 80 deg., or less, to
100 deg., at the rate of 2,000 feet per minute. Heating 2,000 feet in depth,
in the proportion of 20 deg. per minute, night and day, for five months, is
"_per saltum_" in a minute, and 1,440 "_saltums_" per day!

And further still, the Indian Ocean, from which the monsoons are drawn to
Cobi and Central