28 THE BUTTERFLY FARM AT THE ZOO 
Assouan, occupied by officers of the Heavy Camel 
Corps, put the whole of the inmates to flight in their 
pyjamas, and the only wonder is that they ever ven- 
tured to return before daylight. There is something 
strangely repulsive in this low type of life, which 
nevertheless makes a prey of such beautiful and 
highly-developed animals as humming-birds, and even 
the small and fragile quadrupeds of the tropical 
forest. 
