122 REPORT UPON COTTON INSECTS. 



surface of prairio in the State, which turn our northeast trade, or what would be such, 

 to south, southeast, or southwest. [William Barnes. 



Millheim, Austin County, Texas. In some years, the winds are sufficiently strong to 

 have the effect [of counteracting the trade winds]. I have noticed that the strong 

 winds from the south and southwest generally occur in a dry year. [ J. H. Kraucher. 



Union Springs, Autauga, County, Alabama. Trade winds have but little influence in 

 this part of Alabama. [ J. R. Rodgers. 



Jayville, Conecuh County, Alabama. While I think the wind is often strong enough 

 from the south to drive before it the caterpillar fly, I am not at all inclined to the 

 opinion that they get here in that way, unless it be the fly of the army- worm. [An- 

 drew Jay. 



Lake Saint John, Concordia Parish, Louisiana. During March and April the prevail- 

 ing wind is south and west, lasting sometimes a week, strong enough and lasting long 

 enough to bring a moth from South America, I should think. I have no record of the 

 wind, but if the moths are brought here by the wind, which I think they are, it is 

 during the months of March, April, and May. [H. B. Shaw. 



Isabella, Worth County, Georgia. Not often, only occasionally. [Wm. A. Harris. 



Burkeville, Lowndes County, Alabama. South winds but seldom prevail for longer 

 than 24 hours, occasionally two days with decided prevalence. [P. T. Graves. 



Enterprise, Clark County, Mississippi. Rarely ever have strong winds from the south 

 long at a time. [W. Speillmau. 



Dennison's Landing, Perry County, Tennessee. I cannot remember to have observed 

 winds from the south sufficiently strong to have counteracted the prevailing trade 

 winds toward the equator. [A. W. Hunt, M. D. 



Hempstead, Waller County, Texas. Do not believe our winds are sufficiently strong 

 or continuous to have any effect on the trade winds. [S. P. Clark. 



Mulbeiry, Autauga County, Alabama. I can scarcely credit the suggestion that the 

 wind is sufficiently strong and continuous from the south to have much influence on 

 the transportation of the moth. [C. W. Howard. 



From these statements, even where they are given negatively, it will 

 be seen that there are short periods t of strong southerly winds in nearly 

 every one of the cotton States. Upon the sea-coast the winds are of 

 course stronger and more constant in their prevailing southerly direc- 

 tion than in the interior. The question then arises as to how many days 

 will be required for the wind to blow with force in a given direction, 

 to bring the moths from the nearest point to the southward of the 

 United States at which they may be found. 



As early as May, at Indianola, Tex., the winds are almost wholly 

 southerly, and by reference to the weather-bureau records for that 

 month it will be seen that an average velocity of 17 miles per hour is 

 recorded for the five nights from the 15th to the 19th, inclusive j the 

 exact point of the compass indicated being southeast. This is the high- 

 est velocity for southerly night winds at Indianola recorded for the 

 month of May, 1873 (the average being but 9.5 for the entire 31 days), 

 and probably as high as in any other mouth. The average for the nine 

 stations in Georgia, Alabama, Mississippi, Louisiana, and Texas, for 

 the three months, April, May, and June, 1873, is found to be but a frac- 

 tion less than 6 miles per hour. How far then are we able to judge by 

 general averages, when we consider that there are days of almost total 

 calm, the force hardly reaching 1 or 2 miles per hour, and but few days 

 when the velocity reaches 15 to 20 miles per hour I The question of 



