I 9 <S 



PUMPS AND THEIR VALUE TO MAN 



strict supervision, while that of isolated farms, of small sea- 

 side resorts, and of scattered mountain hotels is left to the 

 care of individual proprietors, and in only too many in- 



FIG. 140. Diagram showing how supplying a city with good water lessens 

 sickness and death. The lines b show the relative number of people who died 

 of typhoid fever before the water was filtered ; the lines a show the numbers 

 who died after the water was filtered. The figures are the number of typhoid 

 deaths occurring yearly out of 100,000 inhabitants. 



stances receives no attention whatever. The sewage disposal 

 is often inadequate and badly planned, and the water becomes 

 dangerously contaminated. A strong, healthy person, with 

 plenty of outdoor exercise and with hygienic habits, may be 

 able to resist the disease germs present in the poor water 

 supply ; more often the summer guests carry back with them 

 to their winter homes the germs of disease, and these gain 

 the upper hand under the altered conditions of city and busi- 

 ness life. It is not too much to say that every man and 



