"9, 



Stalking Expeditions in the Nyika 



which occur in a loni;", deep depression ot the desert 

 surface. Over them, near them — everywhere, indeed, that 

 the eye can reach — the infinite desert shimmers in the 

 throbbing!' h^ht. 



1'he whole vast region Hes in a dazzhng glow, 

 intensified by the hot waves of air that ascend from it. 

 Over and over again experience and common-sense have 



[ M 111 I i; I-, IN A W A- 



to be called in to correct the delusions of the eye, which 

 constantly deceives itself with regard to the perspective. 

 For instance, while the eye supposes itself capable of 

 seeino- herds of o;ame down there, as a matter of fact, 

 we can scarcely make out with the naked eye the big- 

 surfaces of our tents below us in the camp — we can only 

 see them with the glasses. It is important that the tents 

 should stand out well from their surroundings, so they 



607 



