356 W. Ferrel—Relation between the Barometric Gradient 
value of zis small. But if the value of 7 is 45°, which is nearly 
the value obtained by Professor Loomis from the average of al 
the stations of the United States Signal Service, then we get 
for the velocity of the wind, under the same circumstances, 
v=21 miles. With a still much greater inclination than this 
circumstances being the same as above, we get v=22 miles in 
wholly contained within the receding theoretical and much 
more general law. Theoretically the direction of the wind can 
tion may be small in the higher latitudes at sea, and on 
level prairie or mostly cultivated countries, where the win 
bstructed by w 
b 
toward the equator, and accordingly we find that the trade 
: t 6 ; + 
tion of the i 
i: isobars about 45°. This la 
a general law applicable to all latitudes, is not even 4P- 
