F. Waldo— fise and Fall of the Wind in the U. 8. 237 
For the Year there is along about the 92d meridian, that is 
in the Mississippi River Valley, a continuous decided rise dur- 
ing 7 hours. 
To the west of this there is a gradual decrease to about 5 
hours at the north; very little change but probably a slight 
increase to 8h. near the coast at the center; a slight but rapid 
increase to 8h. to the south of the center, but in the extreme 
southwestern U. S. a decrease to 6h., and in central south 
Texas a local minimum of 4 hours. 
To the east of the Mississippi River there is: at the north a 
slight increase to 8 hours in the Upper Lake region, with a 
decrease to 5 hours in the Lower Lake region and an increase 
again to 7h. or 8h. near the Atlantic coast; at the center the 
rise of wind continues for 6h. except near the Atlantic coast, 
where it increases to 7h.; at the south there is a rise during 
Th. or 8h. 
At the places of unusually high exposure for the anewome- 
ters on the land, and also for the water exposures, the time of 
rise of the wind seems to differ but little from that of the ordi- 
nary land exposures for the same region. 
III. Average Rate of Increase of Wind to the Maximum. 
The average of rise in miles per hour during the period of 
rapid rise, which extends in most cases from about sunrise tc 
the time of maximum wind, presents regional characteristics. 
for January there is a central region crossing the U. S. 
about along the 100th meridian in which the rise is at the rate 
of 0°4 miles per hour. To the east of this the rate of rise is 
about 0°3 miles per hour: with a local increase to 0°4 m. p. h. 
in eastern North Carolina and Virginia, and to 0:5 m. p. h. on 
the western shores of Lakes Michigan and Huron. Also 
directly in the Mississippi River Valley there appears to be a 
regular decrease from about °35 m. p. h. on the upper Missis- 
sippi to 0-1 or less on the lower Mississippi. 
To the west of the 100th meridian there is a slight gradual 
decrease to 0°3 m. p. h. in the northwestern U.S. ; but there is 
an increase to over 1:00 m. p. h. in the extreme southwestern 
U.S., and in fact a maximum of 1°6 m. p. h. is reached in 
Arizona. In most of the southwestern U. 8. west of the 100th 
meridian and south of the 42° parallel the rate of increase of 
wind is over ‘50 m. p. h. 
For July the average rate of increase of wind is about 0°5 
miles per hour along the 97th meridian. To the west of this 
medial region there is a decrease to 0°40 m. p. h., at the north 
inland, and to less than 0°3 m. p. h. on the coast: at the center 
and the south a slow increase to about 0°6 m. p. h., and then a 
Am. Jour. So1.—THIRD SERIES, VOL. L, No. 297.—SEPTEMBER, 1895. 
16 
