HOW TO KILL TRYPANOSOMES 49 



who may happen at any time to have an 

 opportunity of trying the idea of your carry- 

 ing with you a small box of the ointment I 

 recommended to you in " War with Disease " 

 as a preventative of syphilis — i.e., an oint- 

 ment consisting of one part calomel and two 

 parts lanoline. If you rubbed this well into 

 the site of the bites of the tsetse, horse-flies, 

 or ticks, it seems certain that the trypano- 

 somes would be killed before they could get 

 too deep and multiply. It is an interesting, 

 though a useless, piece of consolation for 

 you to know that the ticks, like the mosquito, 

 which I shall show you in life and motion 

 to-night, are always female. The females 

 of these alone suck blood. The male dies 

 practically immediately after he has com- 

 menced married life. In insect life, indeed, 

 the rule generally is to treat the male 

 horribly badly. The female spider, for 

 instance, eats her husband as soon as he 

 has done his duty by her ; and the female 

 scorpion out-Crippens Crippen by tearing her 

 *'worser half" into several joints and frag- 



4 



