166 HEREDITY IN RELATION TO EUGENICS 



pneumonia in certain families causing the death even of 

 infants (Fig. 144). 

 Likewise a general weakness of the mucous membranes, 



idtO nT# 



-tinf. tin£ 



Fig. 144. — Pedigree of a family with tendency toward lung disease. I, 4, 

 died of pneumonia at 82 years. II, 1, had an attack of pneumonia which ter- 

 minated in tuberculosis from which he died at 43 years. His wife, II, 2, died 

 at 62 years of tuberculosis. Of their 6 children 3 are still Hving; the others 

 all died of pneumonia, 2 in early childhood. F. R.; Mor. 1. 



leading to catarrh, adenoids, tonsilitis, deafness, bronchitis, 

 etc., seems clearly to run in families. Such a case is illustrated 

 in Fig. 145. 



pleuro- 

 pneumonia 



adenoids. adenoids.tl)ronch.l)roncI]^ar, adenoids jidengids 

 pneu. irouDle. toiui!l£(i& 



Fig. 145. — Showing "inheritance" of throat and ear weakness in a family. 



F. R.; New. 1. 



37. DISEASES OF THE ALIMENTARY SYSTEM 



The diseases of the alimentary tract are so largely due to 

 bad habits in eating, exercising and attending to the demands 

 of nature that most physicians consider a possible hereditary 

 basis relatively unimportant. It is, to be sure, recognized 



