36 W. Ferrel on motions of Fluids and Solids 
must have an eastern motion in the middle latitudes; but it 
cannot have such a motion, unless it also have a motion toward the 
poles, in order that the deflecting force (§ 5) arising from this mo- 
tion ~— overcome the resistance to the eastern motion. But 
it is evident there cannot be a complete reversal of the motions 
greater ee 
the tropical calm-belts, where the motion is westward below it — 
must be toward the east above. This is also evident from the | 
general consideration, that the whole amount of deflecting force — 
eastward arising from the motion of the atmosphere towards the — 
cond 
towards the east, the observed notions nearly all the higher 7 
clouds was from some point towards the west. 4 
23. From what precedes, the limit between the atmosphere | 
which moves eastward in the middle latitudes and westward — 
nearer the equator, which at the earth’s surface is at the tropical 
