ISO ELEMENTS OF PHYSIOLOGY 



it. If more food is eaten than can be digested, and it 

 remains longer than five hours in the stomach, starchy food 

 may ferment from yeast plants, giving rise to carbon dioxid 

 gas, and albuminous food may ferment from bacteria, or a 

 moldy growth may form on the lining of the organs, extend- 

 ing up to the mouth 

 and forming a coat 

 upon the tongue. If 

 the lungs are never 

 fully expanded, but 

 by stooping over at 

 work or by tight 

 clothing a part of the 

 lungs is compressed 



j yyjS^j5| ^ an d the blood supply 



QOQ " 25C interfered with, or if 



FIG. I55 .-Shown by Microscope of High Power. f ul air is Constantly 



A, white corpuscles are seen creeping up a tube and devour- breathed, impurities 

 ing bacteria which appear as minute specks. maV Collect in the 



B, a drop of water containing infusoria. The clump in the * 



middle has been killed by the touch of a hot needle, the lungS and the baC- 



others are fleeing from the dead bodies. . . , 



C, a capillary glass tube containing bacteria. One end is tCHa are On the alert 

 heated to 25 C, the other end cooled too C. The bac- to remove them The 

 teria have crowded to the warm end. 



bacillus tuberculosis 



is the form of bacteria that usually finds lodgment in the 

 lungs. 



310. As the bacilli multiply tiny tubercles are formed ; 

 hence the name. Tubercles are growths shaped like pin 

 heads, and they may be formed in any tissue of the body. 

 An attack of consumption is usually preceded by indi- 

 gestion and imperfect nutrition of the body. You have 

 learned that in thousands of cases bacilli remove an injured 

 part of a lung and it heals over. But in thousands of cases 

 the individuals have lived wrong physically for so long, 

 and their lungs have become so weak, that they are 

 gradually destroyed by the bacilli. This is sad to the 



