1350 
POPULATION 
1600 
1650 
1700 
1750 
Journal Royal Society of N.S.W., Vol. XX XVII, 1903. Plate V. 
THE ECONOMIC EFFECT OF SANITARY WORKS 
POPULATION DEATH RATE & EXPENDITURE ON WATER SUPPLY & SEWERACE. 
LONDON 
FIC. | 
1000 
POPULATION MILLIONS 
EXPENDITURE ON WATER 
SUPPLY AND SEWERAGE 
DEATH RATE PER 1000 
POPULATION MILLIONS 
OEATH RATE PER 
CE 
185! 
: 
1600 
(750 
