404 PHYSICAL GEOGRAPHY OF THE SEA, AND ITS METEOROLOGY. 



would report the storm as commencing with the wind at south. 

 For the sake of ilhistration, we will suppose this place of low 

 barometer to be stationary, and the air, as it rushes in, to ascend 

 at the disc C. . Thus the area of inrushing air will gradually en- 

 large itself by broad spreading, like a circle on the water, until 

 it be compassed by a circle with a radius CS, of indefinite 

 length. The air then, on the meridian SON, but to the south 

 of a, will not blow along this meridian and pass over the ship ; in 

 consequence of the diurnal rotation of the earth, it will take a 

 direction, Sa', to the westward ; and the arrow (^ a, representing 

 a S.S.E. Avind, will now show the direction of the wind at a. 

 Thus the ship will report that the wind commenced at south, 

 and gradually hauled to S.S.E., i. e., against the hands of a 

 watch ; and so the arrows h' a will represent the direction of the 

 wind at each station, a a a, when the storm commenced, and 

 the arrows d' a the directions afterwards, thus showing it to have 

 veered against the hands of a watch. And this is the direction 

 in which the forces of diurnal rotation, when not mastered by 

 opposing forces, always require the wind, when not blowing 

 round in spirals and a whirl, to haul in the southern hemisphere. 

 Now, paradoxical as it may at first seem, it is also the forces of 

 diurnal rotation that give that same wind, when it is blowing 

 round in spirals, its first impulse to march round in the contrary 

 direction, or (§ 786) with the hands of a ivatch ; but this is as it 

 should be — it hauls one way, and marches the other. After pass- 

 ing a, and each of the other stations, a a, the rush of wind is 

 sufficient, let us suppose, to create a whirl. The wind at a a a, 

 continuing on with a circular motion, is represented thencefor- 

 ward in its course by the curved aiTows a e, a e. The wind 

 coming from the east and the west has no direct impulse from 

 diurnal rotation, but the wind on either side of it has, and hence 

 the prime vertical wind is carried around with the rest. If, now, 

 we imagine the disc C to be put in motion, and the storm to 

 become a travelling one, we shall have to consider the composi- 

 tion and resolution of other forces also, such as those of traction, 

 aberration, and the like, before we can resolve the whirlwind. 



789. But the cyclonologists do not locate their storms in such 

 r.eniouiiii's formula, high latitudes as the parallels of Cape Horn. 

 Hence we might safely infer, one would suppose, that in high 

 southern latitudes a north wind has a tendency to incline to the 

 westward and a south wind to the eastward ; and the cause of 



