140 INJURIOUS INSECTS OF IQOQ AND IQIO. 
must be borne in mind, also, that these foreigners have brought 
with them from their own countries all their habits; their temper- 
ament 1s unchanged; they surround themselves here with the same 
conditions, as far as they can, which they found congenial there— 
all of these facts make it difficult for the authorities to cope with 
infectious diseases. 
In addition to more modern methods of disposing of sewage, 
there is evidently need of constant, intelligent supervision over these 
people on the part of conscientious experts. Why more of them do 
Fig. 838. Creek into which the sewage.of a large town enters. 
not die of typhoid is a wonder. The same kindly Providence which 
keeps an intoxicated man from harm must be caring tor them in 
their blind ignorance. We left the locality impressed with the ex- 
istence of the following significant factors: Exposed foulness of 
all kinds, including pathological excreta, in close proximity. to 
human food; an enormous number of flies congregating in towns 
