98 SANITARY EDUCATION 



of statistics showing diminution of fly-borne disease 

 when small figures only are obtainable. For example, 

 official health reports sometimes claim the reduction of 

 a disease in a whole town because out of a hundred 

 patients treated in one hospital 10 per cent, suffered 

 from the disease compared with 15 per cent, the year 

 before ; some reports then conclude that there is a 

 reduction of 5 per cent, of the disease throughout the 

 town. Such an inference is not only unjustified but is 

 actually incorrect. If deductions must be drawn from 

 percentages and averages large numbers must be 

 obtained, or the results may be hopelessly misleading. 

 Usually time must elapse before disease-diminution can 

 be justly claimed. But there is always the knowledge 

 that such a diminution is in the making, and that the 

 efforts will be ultimately rewarded. Therefore persist, 

 persevere, try again and again. Be energetic and 

 succeed. 



Without doubt, fly-reduction will reap its reward. 

 The saving of life that is the goal. It is religion, 

 charity, philanthropy, and the greatest aim which any 

 one can yearn for. The highest ambition is this the 

 welfare of others. 



