600 HOW DOES MAN CONSERVE HIS RESOURCES? 



•time' 



ccverarcje -spar* of life 



under Caesars 



\Qyeavs\ 



[France before 1800 



26 -»r«~i eta 



1800 



3>2 _x"eotr-s service 



\Q50 



37r eccI ^ 1 totu {£*** 



I860 



40yean? * I S80 



IQ14- 



4r6year\s 



19 23 



vSTy* 20 ^ 5 



1931 



v59^@acr-s 



\9SO 



? jXectr-s 



Can you give several reasons for the increasing average span of 

 life as indicated in the diagram. 



in the lowering of the death rate in those places ; the discoveries 

 of men of science have been applied toward the cure and prevention 

 of disease, as we can see in the reduction of malaria, yellow fever, 

 and hookworm. The splendid work of Dr. Banting of Toronto in 



his discovery of 

 insulin and its ap- 

 plication in the 

 treatment and re- 

 lief of diabetes is 

 another example 

 of work for the 

 conservation of 

 human life. 



Health exami- 

 nations, both indi- 

 vidual and those 

 given in schools and colleges, should aid individuals in keeping in 

 good physical condition. There are a number of agencies which 

 work directly for health conservation. 



The health work of the National Government. The United 

 States Public Health Service covers practically all phases of the 

 nation's health. It establishes quarantines against diseases com- 

 ing from other countries; it assists local communities in main- 

 taining fights against epidemics ; it has established sanitariums and 

 hospitals for care of government employees, soldiers, and sailors. 

 It maintains laboratories for investigation, research, and statistics 

 concerning diseases. It has a department of industrial hygiene 

 which looks after the health of those in the various industries, 

 and in many other ways has general supervision of the nation's 

 health. 



State and city supervision of health. Most states now have 

 well-established departments of health which do in general the 

 same work as the United States Public Health Service. For 

 example, New York State, which has an unusually efficient organ- 

 ization, has the following divisions : Child Hygiene, Public Health 

 Education, Tuberculosis and Communicable Diseases, Vital 

 Statistics, Sanitation, Laboratories and Research, Public Health 



