THE RED SEA HILLS 
355 
morning good Mahomed Maghazi told me (the camelry 
not having arrived) that our choice lay between 
(i) a wash, and (2) coffee for breakfast. Now I must 
have both . . . and I got them. For, having first 
splashed my face in the wash-basin, we made coffee 
with its contents afterwards. My two companions, 
luckily, still remain unaware of this outrage! Even after 
boiling, the water was bitter—I refer, of course, to 
unused water. 
Ariel are distinctly migratory and at this period 
(March-April) were moving northwards; nor among the 
thousands seen, do I recollect observing any fawns. A 
corresponding counter-movement occurs in autumn when, 
after the rains, vast herds of arid pass southward towards 
the Atbara and beyond. They are among that class of 
wild animal that seasonally shift their ground, higher or 
lower, according to pasturage. Thus hundreds may be 
seen in a locality which a month later is deserted; 
though the abandoned haunt may then be reoccupied 
by gazelles, which also wander afar, but whose require¬ 
ments differ. 
Another predisposing cause for seasonal movements— 
perhaps more potent even than food-supply—is a seroot- 
fly of sorts, which in spring invades the higher grounds 
in ferocious swarms which drive both game and Arab 
herdsmen, along with their flocks, pell - mell from the 
hills. 
If it be permissible to hazard a tentative opinion based 
solely on such narrow limits as personal observation afford, 
I would suggest that such animals as arid, which season¬ 
ally shift their pasturage between higher and lower levels, 
become the more predisposed to extend their migrations, 
since a mobile habit grows. 
The ariel, with a wide migratory range, has developed 
two very distinct forms, to wit :■—the Sudan type, and that 
of Somaliland. The extreme divergence between these 
two has never been adequately recognised. If the reader 
