and the Velocity of the Wind. 357 
shown (§17) by obtaining numerical results in special assum 
cases. It is, moreover, seen that in different latitudes the 
the violence of the wind in a cyclone corresponding to the 
same gradient is much greater within the tropics than in the 
higher latitudes. 
G’= G divided by 100 miles; 
D = the barometric depression in inches at the earth’s 
surface in the middle of a cyclone ; 
we shall have 
10 _ far [0524 sin L-u)v sect 
” p=/G af 830000000 , 
gist has accounted for these depressions. It has been attempted 
to account for them by means of the centrifugal force arising 
Am. Jour. Sct.—Tuirp Sertes, Vou. VIII, No. 47.—Nov., 1874. 
23 
