28 
BULLETIN 1125, U. S. DEPARTMENT OF AGRICULTURE. 
while the Heluan records may better represent Bedrashen and El 
Marazic and such points on the west side of the valley toward the 
desert bluffs as Sakkara and Abusir. 
Table 1 shows the normal mean, monthly, and maximum tempera- 
tures, in degrees F., and Figure 3 the corresponding curves for 
W<?<> 
k \ 
Fig. 3. — Diagram showing the normal monthly mean maximum and mean minimum 
temperatures, in degrees F., for Dakhla Oasis and Heluan, Egypt, in comparison 
with the same for Mecca, Calif., and Tempe, Ariz. 
Dakhla and Heluan, in Egypt, in comparison with the records for 
Mecca, Calif., and Tempe, Ariz. 
In regard to the behavior of the Saidy offshoots from the Libyan 
Desert and from Gizeh we have, first, the observations at Mecca 
and Tempe showing that they display no characters in form and 
quality of the fruit or in time of maturity by which they can be 
distinguished as distinct varieties, so they can be treated as one 
for temperature study; and, second, trees from both these sources 
have ripened their crops at Mecca with heat units to spare, while 
at the Tempe garden, though setting abundant crops of fruit, little 
of it has matured even as far as the processing stage. 
Before taking up the study of the maximum and minimum tem- 
peratures of the regions involved, it is instructive to plot the monthly 
