136 



BIOLOGY OF DEATH 



system takes the front rank, with a higher specific mor- 

 tality rate than any other organ system. 



TABLE 11 

 The most fatal organ systems at different ages 



If onr lungs were as organically good relatively as 

 our hearts, having regard in each case for the work the 

 organ is called upon to do and the conditions under which 

 it must do it, we should live a considerable number of 

 years longer on the average than we do now. One cannot 

 but feel that the working out of a rational and scientifi- 

 cally grounded system of personal hygiene of the respir- 



