690 



WINDS OF THE GLOBE. 





Spring. 



Summer. 



AiilumD. 1 



Winter. 1 



S. 74° E. 



S. 84 W. 



S. 80 W. 



N. 35 W. 



N. 68 W. 

 ! S. 77 W. 



S. 45 W. 



N. 46 W. 



S. 36 W. 

 1 N. 12 W. 



N. 32 W. 

 1 N. 9 W. 



S. 77 W. 



N. 37 W. 



S. 05 W. 



.201 



.20 



■ Hi 



.02 



.16^ 



.04 



.11 



.05 



.08 



.13J- 



.101 



.13 



.10 



.13 



.22 



E^ 



«* 



S' 



M " 







S. E. Indiau Terrilur^ 



Arkansas, 34°-35° N. L 



N. E. Arkansas 



S. 34° E. 

 S. 25 W. 

 S. 20 W. 

 S. 21 E. 

 S. 57 W. 

 S. 4 E. 

 S. 10 E. 

 S. 20 E. 

 S. 3 E. 

 S. 24 E. 

 S. 22 W. 

 S. 37 W. 

 S. 8 W. 

 S. 9 W. 

 S. 32 W. 



32^ 

 .21 

 .05i 

 .23 

 .22 

 .36* 

 .34 

 .27 



■^^ 



.26 



.20 



.211 

 .20i 

 .24 



N. 70° E. 

 S. 54 W. 

 N. 87 W. 

 S. 23 W. 

 S. 29 W. 

 S. 64 W. 

 S. 44 W. 

 S. 4 W. 

 S. 54 W. 

 N. 82 W. 

 S. 76 W. 

 N. 53 W. 

 S. 48 W. 

 S. 73 W. 

 S. 75 W. 



991 

 I? 



• 05J 

 .05 

 35 

 .09 

 .13 

 .04J 



.u" 



.10 

 .21 

 .10 

 .18 



!21J 



N. 37° E. 

 N. 64 W. 

 S. 58 W. 

 N. 05 W. 

 N. 66 W. 

 N. 46 W. 

 N. 79 W. 

 N. 50 W. 

 S. 77 W. 

 N. 03 W. 

 N. 67 W. 

 N. 32 W. 

 S. 67 AV. 

 N. 80 W. 

 N. 77 W. 



.18 



.17 



.14 



.16 



.27 



.20 



.17J' 



.13 



.12i 



.20 



.24 



.16 



.18 



.24 



.25 



N. E. Wyoming 



W. Central Kansas 



N. E. Kansas 



W. anil Central Missouri 



S. E. Nebraska 



N. E. Nebraska 



S. E. Dacotah 



N. Iowa 



S. Iowa 



Here, again, as also shown by the maps (Plates 8 and 11), summer is the sea- 

 son which exhibits more regularity, the mean direction being everywhere between 

 iS. E. and S. W. The ratio of the resultant is greatest in the Indian Territory 

 and Kansas, i. e., due north of the Gulf coast of Texas, and far from the influence 

 of mountains. It is least in Missouri and N. E. Arkansas. 



In winter the winds incline much more to the west than in Texas, being even 

 S. of west, in East Missouri, N. E. Arkansas, and in S. E. Minnesota, i. e., in the 

 extreme east of this region. Except in these regions there is a tolerably good 

 agreement between the other stations. 



The greatest difference between this region and Texas is seen in spring, as 

 shown in Plate 8, when the winds are everywhere more or less westerly, except 

 in the Indian Territory. Probably the cause is this: Texas being situated in a lower 

 latitude is earlier heated, and the air from the Gulf of Mexico is sooner drawn in. 

 The region he're considered being further to the north, ascending currents are not 

 established as early. Besides, when the lowlands between 34° to 42° N. are 

 already heated, and an ascending current established over them, the deficiency is 

 partly supplied by the cold air from the plateaus lying westward, partly by south- 

 erly winds from the Gulf of Mexico, and partly by winds from the polar regions. 

 It is necessary to remember that the distribution of pressure in April and May is 

 not the same as in midsummer. In the region here considered, pressure is lowest 

 in May, Avhile in Utah, and probably also on the lower Colorado, it is lowest in 

 July. In the spring the winds coming from the Gulf of Mexico will be more 

 westerly than in summer, because their point of attraction is more easterly in the 

 former season than in the latter. 



To recapitulate: There is an extensive region in the soutJncest of the United States 

 ivhich has a common yearly period of loinds, different as are its georiraphical fea- 

 tures. It includes the extreme S. E. of California, Arizona, Neio Mexico, Southern 

 Utah, Texas, Arkansas, the Indian Territory, Eastern Colorado, Eastern Wyoming, 

 Southern Dacotah, Nebraslca, loioa, Kansas, and Missouri. The winds are S. E., 

 S., or S. W. in summer, toith a great ratio of the residtant in the soxith, diminishing 



