122 
BULLETIN 1476, U. S. DEPARTMENT OF AGRICULTURE 
Table 40. — Direction and velocity of wind movement in Lake Erie region during 
June and July, 1916 to 1921, inclusive 
June 
July 
Gales (maximum 
Gales (maximum 
Locality 
Year 
Prevail- 
ing 
wind 
direc- 
tion 
velocity 
Prevail- 
ing 
wind 
direc- 
tion 
velocity] 
Velocity 
Direc- 
tion 
Date 
Velocity 
Direc- 
tion 
Date 
Miles 
Miles 
per hour 
per hour 
Long Point, Ont 
1916 
SW. 
37 
SW. 
2 
SW. 
31 
W. 
31 
1917 
sw. 
36 
32 
37 
E. 
E. 
SW. 
6 
7 
3 
"sw." 
35~ 
"sw." 
.... 
34 
SW. 
29 
33 
sw. 
29 
1918 
NW. 
41 
SW. 
11 
"sw." 
37 
NW. 
1 
1919 
NE. 
32 
37 
32 
33 
NW. 
S. 
N. 
NE. 
12 
21 
23 
28 
"sw." 
33~ 
"sw." 
"16 
1920 
SW. 
------- 
32 
30 
NW. 
SW. 
23 
30~ 
..... 
"sw." 
23 
1921 
1916 
SW. 
SW 
31 
37 
31 
58 
NE. 
SW. 
NE. 
SW 
17 
21 
1 
9 
"sw." 
sw. 
None. 
42 
Buffalo, N. Y-_ 
" "sw." 
9 
1917 
SW. 
68 
SW. 
13 
sw! 
72 
NW. 
1918 
SW. 
60 
NW. 
11 
sw. 
60 
SW. 
1 
1919 
SW. 
37 
SW. 
5 
sw. 
47 
sw. 
10 
1920 
SW. 
56 
w. 
29 
sw. 
56 
w. 
23 
1921 
SW. 
46 
SW. 
11 
sw. 
44 
sw. 
28 
Erie, Pa. (169 feet) 1 
1916 
SE 
52 
SW. 
24 
s 
43 
w 
g 
1917 
SW. 
46 
SW. 
3 
sw. 
4-4 
sw. 
13 
1918 
s. 
42 
SW. 
11 
s. 
42 
w. 
1 
1919 
NE. 
34 
NE. 
28 
NE. 
46 
w. 
10 
1920 
w. 
41 
w. 
21 
NW. 
43 
w. 
18 
1921 
NE. 
37 
w. 
13 
NW. 
36 
s. 
27 
Cleveland, Ohio 
1916 
S. 
39 
w. 
16 
NE. 
44 
NW. 
2 
1917 
SW. 
58 
NW. 
23 
S. 
36 
N. 
27 
1918 
NE. 
43 
w. 
12 
NE. 
48 
NW. 
1 
1919 
NE. 
39 
NE. 
28 
NE. 
36 
N. 
15 
1920 
SW. 
53 
W. 
16 
SW. 
44 
N. 
18 
1921 
NE. 
35 
NE. 
4 
S. 
46 
NW. 
14 
Sandusky, Ohio 
1916 
SW. 
38 
W. 
2 
E. 
39 
NW. 
20 
1917 
SW. 
38 
NW. 
19 
SW. 
34 
E. 
21 
1918 
SW. 
40 
W. 
30 
NE. 
46 
NW. 
29 
1919 
w. 
26 
NE. 
21 
NE. 
42 
NW. 
9 
1920 
SW. 
38 
NE. 
17 
SW. 
33 
NE. 
25 
1921 
NE. 
35 
NE. 
3 
SW. 
42 
W. 
30 
Toledo, Ohio (243 feet)» 
1916 
SW. 
45 
SW. 
2 
NE. 
48 
NW. 
20 
1917 
SW. 
48 
SW. 
7 
SW. 
41 
sw. 
1 
1918 
SW. 
44 
SW. 
1 
w. 
40 
w. 
1 
1919 
SW. 
45 
SW. 
19 
sw. 
47 
NW. 
9 
1920 
SW. 
38 
w. 
21 
sw. 
44 
SW. 
8 
1921 
NE. 
39 
w. 
27 
sw. 
56 
NW. 
29 
Detroit, Mich. (256 feet) » 
1916 
1917 
1918 
S. 
SW. 
E. 
37 
46 
44 
w. 
w. 
w. 
2 
2 
1 
( 2 ) 
( 2 ) 
( 2 ) 
1919 
E. 
38 
N. 
20 
( 2 ) 
1920 
W. 
35 
SW. 
28 
( 2 ) 
1921 
E. 
40 
NW. 
27 
sw. 
56" 
"sw." 
"27 
1 Elevation of anemometer. 2 No data. 
THE WATER-DRIFT THEORY OF DISPERSION 1S 
The water-drift theory in the dispersion of the European corn- 
borer has resulted from attempts to explain the spread of this insect 
in the Lake region of the United States during the years 1919, 1920, 
and 1921 and about the shores of Lake Ontario during subsequent 
years. This theory, although difficult to prove, must be considered 
together with the flight-of-moths theory of dispersion about these 
13 prepared by Geo. W, Barber, assistant entomologist. 
