164 HEREDITY IN RELATION TO EUGENICS 



the air. The dry, dusty and often germ laden air is a diffi- 

 culty with which our mucous membranes can hardly grapple; 



little wonder that they, and the 

 whole body, so often succumb. 



Of the diseases of the lungs the 

 most fatal is tuberculosis. We 

 know that it is induced by a germ 

 and that if there is no germ there 

 will be no tuberculosis of the 



Fig. 142.-Pe(ligree of heart ^^^gS. The first impulse of the 



trouble. The father's father, I, modem Sanitarian is to eliminate 



1, died of anguina pectoris at 69 , , -r-» , , i • • 



years; and the mother's father, I, the germ. But thlS IS a SUpra- 



3, died of ossification of the valves herculean task; for germs of tu- 



of the heart at 59. Father and . n • • 



mother are living and said to be berculosiS are found m all Clties 



well Of their children III 3, and in the country amongst most 



died of heart disease at 9 months ^ ■ 



and another, III, 2, had tempo- domesticated animals. The 

 rary heart trouble. F. R.; All. 1. germs are ubiquitous; how then 



shall any escape? Why do only 10 per cent die from the 

 attacks of this parasite? 



I b|% bjt> 



m 



gi 



Fig. 143. — Pedigree of family with heart disease and migraine, I, 2, died 

 of heart disease at 72 years; II, 2, 4, 7, died of "heart disease;" II, 9, died of 

 "heart failure" at 59 years, hardworking physician; III, 1, sufJers from mi- 

 graine; her mother is a semi-invahd from migraine. F. R.; Bra. 1. 



The answer is given by autopsies and the experiences of 

 many physicians. Autopsies show that nearly all mature per- 

 sons have the germs of tuberculosis in their lungs, but, for 

 most part encysted and, perhaps, even completely destroyed. 



