REBREATHED AIR. 



TT is a matter of astonishment to those who un- 

 derstand the importance of a proper observance 

 of the chemical and physiological laws connected 

 with our existence, to observe how great abuse of 

 these laws the system is capable of withstanding. 

 Not a third of the race have any knowledge of, or 

 regard for, the important sanitary rules upon which 

 life and health depend. Men, women, and children, 

 in all parts of the world, huddle together in narrow 

 huts, cellars, and garrets, and breathe over and over 

 again the corrupted air, subsisting at the same time 

 upon the most unsubstantial and improper food; 

 yet they manage to live out many weary days, 

 and months, and even years, in these abodes. 



The power of resistance to external and internal 

 disturbing and destroying forces, possessed by the 

 animal organism, is indeed marvellous. Great as is 

 this power, however, and constant as is the warfare 

 kept up by the vital forces against the unnatural 

 and evil influences of bad air and bad food, the 

 conflict is an unequal one. The inroads of disease 

 cannot very long be resisted ; the great fundamental 



