22 



DATE VARIETIES AND DATE CULTURE IN TUNIS. 



Table 1. — Nornnil mean tcnrpcratures of localities in the desert regions of 



Tunis, Algeria, and the United States. 



Comparing the Tunis localities among themselves, we notice that 

 during most of the year the Jerid oases (Tozer and Nefta) are the 

 warmest, and that next to them is the Nefzaoua (Kebili). In Novem- 

 ber, December, and January, however, the highest means are reached 

 at Gabes, on the seacoast. The normal yearly means are higher in 

 the Jerid and the Nefzaoua than in any of the Algerian oases. The 

 diflference is particularly noticeable during the winter months, when 

 the means are decidedly low^er in the Algerian oases than in those of 

 the Jerid and the Nefzaoua. The normal means of most months are 

 higher in the Jerid and Nefzaoua oases than at Phoenix, Ariz., but 

 lower than at Yuma, Ariz. They are much lower in every month 

 than at Volcano Springs, Cal. 



lABLE 2. — Normal mean maximum, and m,inimiim temperatures of loealities in 



tJie desert region of Tunis. 



92 



