and the Velocity of the Wind. 351 
well as a motion of gyration, and hence 7 must have a positive 
value. This, it is seen, is obtained from observation for each 
one of the 15 stations taken separately. Moreover, the inland 
stations, where the resistances are greater, give a greater value 
of 7 than the stations on the sea coast, where the resistances are 
smaller. This likewise accords with theory. 
From the small value of 7 obtained by Mr. Ley for the coast 
tations, we may infer that at sea, and likewise in the upper 
value of 7, therefore, in (8), except at internal stations where 
the resistances are great, may be regarded so small that its 
secant canbe taken as unity, and hence either the gradient or 
the velocity of the wind is known the one from the other. 
For inland stations near the surface, where the resistances are 
great, the value of 7 must be obtained from observation. 
11. With regard to the inclinations of the winds to the iso- 
Ley obtained for the inclination of S.E. winds 35° 11’, of N.E. 
winds 17° 48’, of N.W. winds 9° 4’, of S.W. winds 20° 13. In 
these results S. winds were taken as S.W. winds, E. winds as 
S.E. winds, &. Hence E.S.E winds have the greatest, and 
W.N.W. winds the least inclinations to the isobars, which cor- 
respond very nearly to the . and S.W. sides of the cy- 
clones. Mr. Ley states that the average direction of the cylones 
was about N.E. Hence it appears that the inclination of the 
front part of the cyclone is greatest, and that of the rear the 
least, and this may perhaps be found to be a general law. It 
was also found that the differences in the inclinations of the 
and hence, in general, the strongest winds are found to have 
the least inclinations to the isobars. And as the tendency of 
the very rapid gyrations near the center is tv approximate to a 
circular gyration, it is evident that the inclinations must b 
more regular with such winds, which are oe gales, than 
with light winds; as found to be the case by Mr. Ley from 
observati : 
12. If the water in a basin of water has an interchanging 
