MALARIA EXPEDITION TO NIGERIA 
26 
source of the infection. Such undertakings ought to continue absolutely free from 
malarial fever, if the above precautions were practised. 
For the prevention of malarial fever among European crews on board ship, 
the regular administration of quinine, according to the suggestions of Professor 
Koch, seems to us very feasible. We have shown how Anopheles come on board 
and remain often a considerable time. There is also a possibility of their becoming 
infected from the few children which are carried from port to port on the West 
Coast of Africa. The chief source of their infection is, of course, the children of the 
native towns opposite which the vessels anchor. Professor Koch suggests that the 
administration of quinine be undertaken in the following manner, and there is no 
reason why this should not be regularly carried out by the ships' doctors, after the 
outward-bound vessels have reached the coast. Fifteen grains of quinine are to be 
administered on each of two successive days, preferably in the early morning ; then 
a period of seven days without the drug is allowed, and the administration of fifteen 
grains again continued daily for two days, and then another seven days' interval, and 
so on, for the whole voyage. 
T 
