Appendix lI: Phytogeography and Geology. 1087 
to the 5—10 kilometres beyond the limits of the cultivation, and 
of this area none of it can be said to be effective seeing how small 
a quantity of rain falls. A few rain storms occur every winter but 
they are usually very local in their effect. On the eastern side the 
much larger area, and the steeper slopes, together with a greater 
frequency of rain near the Red Sea hills make the winter rainfall 
a more important factor. 
In a trough from 2—10 kilometres wide and 100—300 metres 
deep lies the Nile, meandering through a flood plain formed by 
yearly deposits of silt brought down from the Abyssinian table land 
by the Blue Nile and the Atbara. 
At Aswan two series of climatic observations exist which agree 
very fairly well. ‘The first was taken at the Military Hospital at the 
north end of the town, while for the second series the thermometer 
screen is on the east bank of the river just below the reservoir 
dam about 200 metres from the river. Climatological stations were 
established at Assiut, Sheykh Fadl, Beni Suef, at Giza, Cairo and 
other places. 
Mean Monthly Temperature. 
lel t= (ati eves ict Ife Malla Mean ee Y= 
Locality Schl Sot So) Si Sie labbeupsceriaul as 
@aironseetucc ce: 12.3/13.8/16.9121.2|24.8 27.7/28.6/28,1/25.6/23.6 18.9|14.8 21.4 
Giza ... . . 410.9/13.0/15.2)19.3)22.7/24.8/25.7/26.1|24.0/22.0]17.1/12.9| 19.4 
Beni-Suef . . . [12.6/14.1)16.8/20.8)24.9/26.9|28.1/27.2)25.3/23.2/18.5|15.0) 21.1 
Sheykh-Fadl. . |11.0)14.0/17.0/21.3/25.2|27.4/28 .6/28.5|25.5/22.8/16.7|12.7| 20.9 
ASST See et sah): 10.6/13.5)16.9/21.9/25.8)28.7|29.9|29.5/26.6/23.6/17.3)/13.8) 21.5 
Nag Hamadi. . |12.4/15.7|19.4|24.7/27.3/29.9|30.1/30.1/27.6125.0/23.5|14.8) 23.3 
Ibilkeyorr 6 5 5 a | IPAM E a SS ee SG) 
Khareas 26. 415.8 15.3/18.7/23.9|29.4/31.6/31.3/32.3/27.1/24.0|18.1! — [26.1] 
Aswan Rest 
Camp. . . . 416.8/17.5/20.9|26.6/30.3|/33.3|33.9/32.0/30.4/28.6/26.6/18.2) 16.0 
Aswan Reservoir |14.5|18.5'21.4/26.1/30.0/32.4 /32.7/32.4/30.3/27.9/21.7|17.0) 25.3 
Se eM Mash lta |) cipal a pel obese em Epes li alien) [OHS IA ie gs 
Localit ese a (oS nilyeet ors a | 2 ee 
uy [2 (2/3 (E/E (2/2/28 (222 (2 
Caron. 51 69) |) GomISO a eam 47 UAT SOR SbGR 62S 66R 66: |) 70) oi 
Gazaieis fe 2 82) |. 77) MOMs 575 25% 1630.67 | Taito: 1075" |) BL gO 
NSS eT -OOe| OF SOOM AON a0 m role oon 42h oGul"G2 "| On OOn poe 
Aswan ©1057) | (87 5| 32) 80 e2ael)) 24022. | 981 30039 | 345M 3 
