HOUSEHOLD BACTERIOLOGY 



No Germ* 

 fro Disease 



Favorable 

 Conditions 



eased tissues ; by inhaled dust, as most often in tuber- 

 culosis or consumption ; or by food or drink in which 

 was the germ which is capable of causing a specific 

 disease as typhoid fever, diphtheria, etc, or through 

 some wound in the skin. Figs. 40, 41, 42. 



If the specific germ of typhoid fever, tuberculosis 

 or pneumonia, etc., is not pres- 

 ent the disease will not appear, 

 no matter how "run down" or 

 "below par" the person may be. 

 But any condition short of nor- 

 mal health any weakening of 

 the body by cold, indigestion, 

 fatigue, overheating, lack of 

 nourishment, etc., tends to lessen 

 the resistance in some part or 

 the whole of the body and makes 

 the attack of any germ which 

 comes along more surely suc- 

 cessful. 



Any inherited weakness, as 

 weak lungs, sluggish circulation, 

 imperfect digestive powers, in- 

 creases the danger or liability to 

 attacks of germ diseases. Given the germ under fa- 

 vorable conditions for its growth, it is then a question 

 of the resistant power of the individual, aided, per- 

 haps, by medical science, whether the body or the dis- 

 ease will gain the victory. 



FIG. 41. Bacillus of 



Diphtheria. 

 (After Conn.) 



