Prevailing Currents of the Atmosphere. 309 
chart of 1835,* and so as to impinge with equal weight and sur- 
face on all sides of the pin or axis, and’the incumbent body will 
be found to revolve from right to left, in ~ manner of the storms » 
of the northern hemisphere. 
This experiment requires delicate. management, and is more 
difficult because of the necessary rigidity of the incumbent sur- 
face, causing one part partially to counteract another ; but in the 
case of a fluid, where all the particles move freely upon each oth- 
er, no such impediment exists. 
As it is chiefly the lower stratum of oe hich | is ies et into 
gyration from this cause, it must be evident, as above suggested, 
that within the geographical. limits of the trade winds the great 
circuit of aerial revolution must be a nearly horizontal one, and 
that the storm tracks mark distinctly the usual course of this rev- 
olution. Consequently, the main outflowing course of the trade 
wind from the er asta is hot in the wre magne of 
the atmosphere.f 
~ It was my design to ive sllowea: sein sel remarks with 
a detailed explanation of the delineations of the several systems 
of te winds which I have placed on the maps before re- 
ferred This was particularly my intention as relates to the ex- 
fthabes “eu abiuts of the monsoons, and the several belts of 
light winds and calms which may be viewed as. the anticlinal and 
synclinal axes, so to speak, of the several systems of general 
winds. But the lateness of t the, eal and my necessary avocations 
i prevented me from bor, in time for the expe- 
Sin. ; % : iting seis fe ett 
This” egies seashthiiags 2 thes ‘results of. deapibien which I 
Sian pursued with. no little interest, is now commended to the 
gentlemen of the ex] for their impartial examination ; and 
With the he expectation ainbdetine, that truth only, as apart from 
any favored yk be er of their researches in nat- 
ural science. © ig ane cae 
il 
be found ie this Journal, Vol. xxx1, for October, 1836; also 
iugaine, April, 1836, and Col. Reid’s work on the Law of 
* This Shiart diohe 
in London Naniticat M 
Storms. 
t This is oa abo by the fpiceastinshy heat of the summers in countries 
near the western estern boundaries of the great oceans, this heat being conveyed horizon- 
tally by the surface winds from the lower latitudes; while in winter the results 
ified and an opposite state of temperature induced, by causes which are 
peculiar to continental meteorology. j 
