40 W. Ferrel on motions of Fluids and Solids 
of all those which Redfield has investigated, and given in his 
charts of their routes, none have been traced within 10° of the 
equator. The typhoons or cyclones, also, - - China sea, have 
never = observed within 9° of the equat 
. In the case of the general Semiiegheinicid motions the inter- 
nal or polar part is most dense, but in the case of cyclones the 
external part. Hence the motions between the centre and the 
external part are different, in the former case the motion toward 
the centre being above, bat in the latter below. In the case ’ 
no resistances from the earth’s surface this does not affect th 
gyrations, since on aes of the action of the different idl 
the eR re to recede en es from the centre, but on account 
of the resistance the very rapid gyrations are in general in a 
great measure prevented, so that instead of a complete vacuum 
the strata of the atmosphere are somewhat, cape in 
of no resistances, is acti is in a great measure destro troy: the 
resistances of the surrounding atmosphere, so that it is, for the 
most part, insensible to setae and only the more Ly ae 
gyrations of the internal observed. The motion of 
ration combined with the mde at the earth’s surface to 
the centre, gives rise to a spiral motion towards the aie 
exactly in accordance pose the Senet —— i -~ atmo- 
sphere in great storms or hurrica’ shown by — 
Redfield, in a number of papers on the tae oablidhed in this 
Journal. 
