540 F. V. EMERSON 
Orleans, for Vicksburg and Memphis are located on the loess, and, 
moreover, the directions at New Orleans are complicated by local 
land and sea breezes which do not extend far inland. It will be 
seen that the prevailing winds at New Orleans and Vicksburg are 
Mar. April Way June July Auge Sept. Oct. Nev. Dec. 
Memphis, Tenn. 
SSS 3077 
Vicksburg , Miss. 
NRRN ANT Se 
New Orleans, La. 
OG 
Fic. 3.—Diagram showing the directions of prevailing winds at New Orleans, 
Louisiana, Vicksburg, Mississippi, and Memphis, Tennessee. (Data from Bulletin Q, 
by A. J. Henry, U.S. Weather Bureau, 1906.) 
southerly, and probably would account for the greater accumula- 
tion of loess at the southern ends of Avoyelles Prairie and Sicily 
Island. On the other hand the easterly winds greatly exceed those 
from westerly directions, except at Memphis, where the westerly 
Mar. April June July Auge Sept. Oct. Nov. Dec. 
Se 
‘ha RRR] 8 
Fic. 4.—Diagram showing the occurrences of high winds at New Orleans, 
Louisiana, and Vicksburg, Mississippi. Lengths of arrows are proportional to fre- 
quency. (After data by I. M. Cline, of the U.S. Weather Bureau at New Orleans, 
and W. E. Barron, of the U.S. Weather Bureau at Vicksburg.) 
winds predominate. Fig. 4 shows the frequency of high winds at 
New Orleans and Vicksburg. At New Orleans about 26 per cent of 
high winds are from easterly directions, 17 per cent from westerly 
directions, 32 per cent from northerly directions, and 25 per cent 
from southerly directions. At Vicksburg 29 per cent of high winds 
