2l8 



ARBORICULTURE 



pathway of the wind will and do cause 

 the same circular motion in the atmos- 

 phere as is seen in the moving waters. 



The whirlpool, or gulf, as it wau 

 temied, was described in i8ri in "The 

 Navigator," a periodical ])ublished in 

 Pittsburg, but which I have never seen. 

 It was noted on the map of a recon- 

 naissance made in 1821. which is very 

 nearly the same jiosition as my memory 



fleeted upward and mingled with the 

 cold upper strata. 



THE AMERICAN SIROCCO 



Is caused by the prevailing winds from 

 southwest to nortlieast during July and 

 August, passing over a vast tract of 

 superheated sand and sandy soil, begin- 

 ning in Me.xico, traversing Texas, Indian 

 Territorv. Oklahoma, Kansas and Nc- 



G.R/1WD GULF 



wiiiUMuoi. riii:.\u.\ii:.\(»N. (;i;.\.\i> cri.F. miss. 



recalls when I rowed through it during 

 the fifties. When the "cut-off" was 

 made, the Mississippi changing its course, 

 this phenomena was destroyed and its 

 former location is now an island of sand. 



THE AFRICAN SIROCCO 



Originates in Egypt. Beginning on the 

 Libyan desert, the heated current Hows 

 Northwest, crossing the Mediterranean 

 it reaches Malta, Sicily and Italy, travers- 

 ing twelve to fifteen hundred miles of 

 treeless, mountainlcss region, over desert 

 and sea, having no obstruction until it 

 reaches the Apennines, where it is de- 



braska. reaching part of Ir>\\a and Mis- 

 souri. A region uf plains without moun- 

 tains, high hills or forests to break its 

 continuity, the atmosphere takes up addi- 

 tional heat as it passes in succession over 

 miles of hot and arid sands — until its 

 breath withers all vegetation with which 

 it comes in contact. Both man and 

 beast suffer as well, the over-heated air 

 being terribly (jjjpressivc. This condi- 

 tion can be changed by the systematic 

 planting of trees in belts to break the 

 continuity of the currents and prevent 

 such an accumulation of heat by the sur- 

 •face currents. At each successive ob- 



