MALARIAL FEVERS 251 



For the protection of individuals from the bites of 

 mosquitoes, infected or otherwise, a mosquito-bar at 

 night and a suitable veil of mosquito-netting in the 

 daytime will be the most reliable resource. Various 

 substances which are obnoxious to the insects may 

 also be rubbed upon exposed portions of the body. 

 Of these oil of eucalyptus is perhaps the most effica- 

 cious. The following prescription is said to serve a 

 useful purpose when applied to the hands and face : 

 Ether and alcohol, of each five parts ; cologne water 

 and oil of eucalyptus, of each ten parts ; tincture of 

 pyrethrum fifteen parts. This is to be diluted, be- 

 fore it is used, with four or five parts of water to one 

 of the mixture. An infusion of quassia is also said to 

 be useful for the same purpose. 



If by the measures heretofore referred to the bites 

 of infected mosquitoes can be avoided no other pro- 

 phylaxis will be required. But those who are unavoid- 

 ably exposed in malarious regions and who, with all 

 possible precautions, are unable to escape the bites of 

 these insects will do well to take quinine in doses of 

 six to ten grains during the day at intervals of four or 

 five days. This is believed to be better than a daily 

 dose of a smaller amount. 



