SEWER DESIGN 



in population during the years 1881-1890 for cities of 8000 

 to 50,000 inhabitants, and also for cities of over 50,000 inhab- 

 itants; and while the increase for the first series varies from 4 

 to 267 per cent, and for the second from 7 to 360 per cent, 

 they conclude as a rapid generalization, first, that in American 

 towns having a population less than 50,000 the present rate of 

 increase may be taken at about 100 per cent in from 15 to 20 

 years; and second, that in the larger towns the increase will be 

 about 50 per cent in the same time. They further say that 



TABLE XII 



TABLE SHOWING RATES OF INCREASE IN POPULATION FOR CITIES 

 OF DIFFERENT SIZES 



analyses of 400 towns given in the Census bulletin referred 

 to above show that about 25 per cent have doubled in the 

 decade 1880-1890, and that the towns showing this large 

 increase are situated in all parts of the country, many of them 

 in the older settled States where fixed conditions may be sup- 

 posed to have been reached. In the case of towns of over 



