JANUARY 11, 1884.] 
ferrence, the direction of the wind as shown by 
-a vane will be the simple resultant of its whirl- 
ing and progressive motions: in the case of 
successive transplanting, it will be the result- 
ant of the earth’s deflecting force and a curve 
of pursuit; a curve of pursuit being the path 
followed by a body moving towards a point that 
is continually changing its position. In either 
case, the effect may be sufficiently represented 
by fig. 18, in which the broken arrows show 
the motion of the wind with respect to the 
storm-centre, and the straight dotted lines 
measure the velocity of the storm’s advance. 
The wind will seem to blow along the result- 
ant of these two directions, as shown by the 
full arrows ; and the resulting inclinations are 
Fig. 19. 
manifestly less in front than in the rear, and 
less on the right than on the left. With the 
variation of inclination, there will be an in- 
verse change in the wind’s velocity. It will 
blow faster on the right and rear or dangerous 
side of the storm, and slower on the left and 
front or manageable side. In the North Atlan- 
tic, where the storms often move rapidly, while 
a hurricane prevails south of the centre, very 
SCIENCE. 
43 
moderate winds may blow on the north; the 
difference between the two being about twice 
the storm’s progressive motion. The change 
in inclination has been shown to occur in some 
of the West-Indian hurricanes, but it is not 
‘very pronounced in the land-storms of the 
temperate zone. Its best application is in 
storms on mountain summits; as on Mount 
Washington (fig. 19), and again in the case 
of the outflowing winds in the upper half of 
the storm, as shown by the motion of cirrus- 
clouds, and illustrated in fig. 20. Of course, 
in this case of outward motion, the less incli- 
nation is in the rear, and the greater in the 
front. 
Third, in regard to land and sea storms. The 
inclination will be greater in the former than in 
the latter. On the sea, the centrifugal force 
of the earth’s deflection will be most pro- 
nounced, and the winds will be more nearly 
circular than on land, where friction will tend 
Fie. 20. 
to destroy their original motion, and so allow 
them to run more directly into the storm-cen- 
tre. ‘This is fully borne out by observation, 
and is especially well shown in the contrasted 
cases of storms on the opposite sides of the 
northern Atlantic. Fig. 21 shows an average 
storm in the eastern United States, about ready 
to embark on the ocean ; and in this the inclina- 
tion of the winds is less on the sea than on the 
land side. This effect is doubtless produced in 
part by the preceding condition concerning the 
front and rear sides of the storm. But in ex- 
amining a storm just about landing on the 
western shores of Europe, as shown in fig. 22, 
it is seen that here the front winds have the 
greater, not the lesser, inclination : hence posi- 
tion in regard to the centre cannot be the cause 
of the differing inclinations here. A better ex- 
planation is found in the fact that the eastern 
