INFLUENCE OF WIND ON MIGRATIONS. 209 



Table of tcind frequency , or number of times each wind was observed, 4'c. — Continued. 



Station. 



Date. 



N. 



x.\r. 



w. 



S.W. 



S. 



S.E. 



E. 



X.E. 



Calm. 



(21) Saint Louis, Mo 



May, 1874 



1 

 IG 



12 



2 



13 



25 



14 



8 



2 



I 





^' 5 



8 



10 



9 



14 



19 



9 



15 



7 



2 





6 



8 



5 



6 



22 



19 



6 



15 



8 



4 





June, 1874 



10 



5 



5 



16 



29 



11 



7 



4 



3 





5 



8 



■ 8 



11 



18 



21 



9 



5 



8 



2 





6 



5 



10 



12 



26 



17 



7 



7 



5 



1 





July, 1874 



21 



4 



8 



13 



2(5 



3 



5 



11 



2 





5 



6 



9 



14 



22 



13 



8 



C 



10 



5 





6 



7 



5 



8 



17 



26 



7 



10 



12 



1 





Aug., 1874 



16 



7 



5 



4 



19 



14 



16 



n 



1 





5 



12 



10 



9 



15 



24 



5 



4. 



11 



3 





ti 



c 



4 



8 



10 



36 



9 



11 



8 



1 





Sept., 1874 



12 



6 



4 



3 



27 



24 



9 



3 



2 





5 



11 



10 



5 



21 



14 



7 



5 



17 









6 



20 



13 



3 



If. 



19 



1 



5 



9 



4 



(22) Saint Paul, Minn 



May, 1874 



20 



12 



7 



5 



16 



14 



8 



9 



2 





5 



6 



17 



6 



7 



8 



30 



3 



6 



10 





6 



16 



13 



5 



10 



8 



18 



7 



11 



5 





June, 1874 



8 







6 



6 



10 



26 



11 



5 



3 





5 



10 



11 



12 



7 



9 



20 



12 



2 



7 





6 



8 



22 



11 



15 



8 



16 



3 



3 



1 





July, 1674 



7 



19 



6 



9 



12 



22 



6 



3 



9 





5 



11 



18 



7 



14 



15 



11 



3 



6 



8 





6 



13 



n 



2 



7 



11 



23 



2 



5 



11 





Aug , 1874 



12 



9 



3 



6 



5 



31 



15 



- 7 



5 





5 



9 



17 



5 



6 



10 



27 



3 



5 



11 





6 



3 



11 



9 



2- 



16 



35 



7 



2 



8 





Sept., 1874 



7 



16 



5 



13 



17 



21 



4 



2 



5 





5 



16 



14 ' 



6 



5 



10 



24 



3 



3 



9 





6 



15 



22 



6 







11 



12 



7 



9 



8 



(23) Virginia City, Mont 



May, 1874 



4 



11 



7 



13 



8 



13 



10 



3 



24 





5 



4 



11 



18 



20 



1 



13 







7 



19 





6 



2 



5 



13 



11 



7 



10 



5 



5 



35 





June, 1874 



6 



16 



10 



15 



6 



7 



3 



1 



26 





5 







8 



13 



11 



7 



18 



3 



8 



22- 





6 



1 



6 



21 



7 



7 



19 



5 



4 



20) 





Jnly, 1374 







6 



11 



14 



12 



11 



5 



5 



29 





5 



1 



«8 



8 



4 



7 



19 



11 



15 



20 





6 



1 



11 



11 



9 



9 



10 



6 



9 



27 





Aug., 1874 



5 



4 



7 



9 



15 



15 



6 



5 



27. 





5 



1 



3 



17 



3 



6 



17 



6 



11 



29 





6 



2 



5 



14 



8 



5 



12 



8 



6 



33 





Sept., 1874 







6 



14 



9 



4 



11 



6 



3 



37 





5 



1 



10 



14 



5 



3 



31 



9 



7 



10 





6 







4 



12 



7 



4 



15 



5 



5 



38 



(24) Tankton,Dak 



May, 1874 

 5 



9 



13 



7 



10 



20 



g 



9 



16 



2 





5 



22 



3 



9 



Itj 



18 



3 



6 



11 





6 



7 



9 



5 



5 



13 



23 



15 



7 



9 





June, 1874 



2 



15 



7 



9 



15 



23 



8 



10 



1 





5 



8 



15 



7 



8 



5 



20 



10 



12 



5 





6 



6 



30 



5 



7 



10 



10 



9 



6 



7 





July, 1874 



5 



10 



4 



22 



7 



16 



9 



16 



4 





5 



11 



11 



3 



6 



11 



13 



13 



10 



15 





6 



4 



7 



2 



5 



31 



21 



7 



7 



9 





Aug., 1874 



6 



10 



1 



5 



6 



27 



15 



17 



6 





5 



8 



17 



2 



6 



15 



21 



6 



5 



13 





6 



6 



9 



7 



4 



24 



25 



10 



5 



3 





Sept., 1874 



2 



20 



2 



11 



11 



10 



7 



9 



12 





5 



14 



15 



6 



7 



15 



11 



5 



7 



10 





6 



5 



31 



6 



2 



9 



13 



15 



6 



3 



In studying the preceding table we must bear in mind, on the one hand, the charac- 

 teristics peculiar to each wind and each portion of our country ; and, on the other, the 

 needs and peculiarities of the locust. Of these latter, I apprehend that the important 

 points accord with the following three hypotheses : 



1. During the unfledged state the locust is killed by too low temperature or much 

 rain. Now, the strong winds tend to scatter *.he insects further in the direction toward 

 which they blow, and the cold and wet winds kill off the insects, preventing their in- 

 crease on the side toward which Ihey blow ; the result is an apparent migration, which 

 is simply an excess in the spreading of the insects by the strong winds. 



2. A moist atmosphere, or one of rather high ''relative humidity," prevents the wings 



