126 EEPORT UPON COTTON INSECTS. 



The tri-daily records for the year 1873 were decided upon, as this was 

 known to be a year in which the worm was particularly destructive, and 

 thirteen stations were selected, in South Carolina, Georgia, Florida, Ala- 

 bama, Mississippi, Louisiana, Texas, and Tennessee, from which to ob- 

 tain the necessary data. As the moths are nocturnal in habits, the 

 night winds only were considered, and the record of 11 o'clock p. m. for 

 each day of the nine months, from February to October, were tabulated, 

 making, in all, between four and five thousand daily records. From the 

 interesting data thus obtained a number of tables have been prepared, 

 which confirm the previous statement. In studying the tables of velocity, 

 it will be noted that the figures are very low in some cases, and it must 

 be borne in mind that the records are for night winds, which are always 

 lighter than the winds occurring in the day-time, unless when preceding 

 or accompanying storms. The storm winds, generally speaking, are 

 from other points of the compass than south. 



The calms have also been considered the records for furnishing inter- 

 esting data for study in connection with ^the subject of this* chapter. 

 Twenty-five days (nights) of calm in July, and twenty-seven days in 

 August, in Augusta, Ga., would not assist the moths in their migrations 

 in that locality to any alarming degree. It is worthy of remark, how- 

 ever, that Augusta is an exception to the other stations in this matter 

 of calms. 



The records for Texas, made at Indianola and Galveston, should be 

 corrected slightly for inland localities, as the winds on the coast, and 

 backward for a few miles, are more invariably southerly, and blow with 

 greater force than higher up in the cotton regions. They are not far out 

 of the way as indicating general direction, as can easily be verified by 

 reference to inland stations in adjacent States. Key West, Fla., was 

 particularly chosen from its maritime situation, and is an exception to all 

 the other stations, the wind prevailing from the eastward for almost the 

 entire nine months, as indicated in the tables, the prevailing direction 

 in February and October being northerly. A study of wind records at 

 various points on the West India Islands would prove interesting, and 

 might throw considerable light upon the question under consideration. 



The four following tables show the prevailing direction of winds at the 

 sattions named for the months of February to October (inclusive), 1873, 

 and the fifth contains a summary of the whole. 



By reference to the first line of figures in Tables A and B for each 

 station, the total number of northerly, east, southerly, or west winds, and 

 number of days of calm for each month, will be found indicated by the 

 word direction. In the second line is given the average velocity in miles 

 per hour, expressed decimally, and in the two remaining lines the highest 

 and lowest records of velocity during the month are stated. In some 

 cases an apparent discrepancy may be noted between the number of 

 days in the calendar month and the total number of days of recorded 

 winds and calms, caused by the absence of observations, in some in- 



