700 



WINDS OF THE GLOBE. 



N. Bahamas .... 



N. 87° E. 



.45 



S. W. Florida .... 



N. 25° E. 



.08i 



S. E. Florida .... 



N. S8 E. 



.33 



E. Louisiana .... 



S. 85 E. 



.20 



Alabama and Mississippi, S. of 31° 



N. 59 E. 



.06^ 



W. Florida .... 



N. 61 W. 



.05i 



N. E. Louisiana 



S. 61 E. 



.12 



Alabama, ol°-32° 



N. 29 E. 



.09 



N. E. Florida .... 



S. U7 W. 



.12 



Mississippi, 33°-34° . 



N. 18 E. 



.03 



Mississippi, 31°-32^ . 



S. 80 W. 



.06* 



Alabama, 32°-33° . 



S. 66 W. 



.03 



Mississippi, 34°-35° . 



S. 46 W. 



.ISA 



Alabama, 33°-34° 



S. 88 W. 



.12 



Florida Keys .... 



N. 76 E. 



.4ii 









Except the last-named areas, we find a ratio of .20 in E. Louisiana, where it is 

 due to the combination of the S. E. winds of summer, spring, and autumn, with 

 the N. E. of winter. Then we have .18| in the extreme N. of Miss., which 

 belongs approximately to the zone of S. W. winds between the Mississippi and 

 Appalachian chain. All the others have a very small ratio. 



TROPICAL NORTH AMERICA AND WEST INDIES. 



Mexico, Central America, and the West Indies are in the belt of trade-winds, 

 but these are modified by the land-masses of North and South America. There is 

 a great difi'erence between the east and west shores of the first two countries. 

 In the east, on the Atlantic Ocean, the heating of the continental areas increases 

 the force of the trade-winds, or we may better say, induces monsoons blowing from 

 the sea to the land in a direction but slightly difi'erent from that of the trade-wind 

 itself. 



On the western shore, on the contrary, the direction of the monsoon would be 

 more or less opposite to that of the trades. If, as is the case near the tropics, the 

 land is not warmer than tlie sea in winter, we shall have trades in this season 

 near both coasts, the direction of the wind being nearly the same, and very dif- 

 ferent winds in the summer. This is the case in INIexico. We do not have ob- 

 servations on the western shore of that country, but can supply them by ship- 

 observations taken on the Pacific Ocean, near the Mexican shores. (See Maps, 

 Plates 3, 5, 6, and 7.) The percentage of winds is — 





Summer. 



Winter. j 





» 





« 





^' 





^ 





H 





W 





^ 





^ 





^ 



Z 



w 



tc 



w 



«j 



is 



a 



fc 



S 



H 



w 



oj 



to 



^ 



^ 



Pacific Ocean — 

























25°-.30° N., 105°-125°W. 



30 



24 



0.3 



1.2 



0.3 



0.6 



6 



.S7 



35 



19 



5 



4 



2 



5 



10 



20 



20°-25° N., 105°-115° W. 



10 



2 



4 



4 



2 



11 



31 



37 



' 33 



11 



5 



5 



6 



« 



13 



24 



15°-20° N., 110°-120°W. 



29 



17 



6 



6 



2 



11 



17 



14 



26 



63 



11 



0.8 











1 



7 



Vera Cruz . 



28 



9 



13 



23 



11 



6 



9 



1.5 



41 



8 



16 



8 



11 



2 



3 



11 



City of Mexico 



14 



34 



9 



11 



3 



2 



6 



11 



5 



4 



10 



23 



22 



20 



15 



3 



The N. W. winds of summer, the Mexican monsoon, as it is called, are seen to 

 prevail especially between 20°-25° N. The cause of this may be that Northwestern 

 Mexico, as also the adjoining part of the United States on the lower Colorado, is 

 much more heated in summer than the zone between 15°-30°, which has at that 

 time the regular trojiical rains. As to Vera Cruz, it seems that the frequency of 

 the N. winds is partly local, at least in summer, as the winds in the Mexican Gulf 



