30 



HUMAN BIOLOGY 



pus is formed. But if the bacteria get the upper hand in 

 the struggle, many of the corpuscles are killed, and it is the 



dead white cor- 

 puscles that form 

 the pus. 



In case of a cut 

 the wound should 

 be cleansed as 

 quickly as pos- 

 sible with peroxid 

 of hydrogen or 

 some other germ- 

 destroying solu- 

 tion, and should 

 then be covered 

 with absorbent 

 cotton soaked 

 in the peroxid 

 solution and 

 bandaged, to 

 prevent the en- 

 trance of other 

 germs. If this 

 is not done, 

 bacteria are 

 likely to settle in 

 the wound, and 

 healing may be 

 delayed or even more serious results may follow. With 

 proper treatment a wound should show no signs of inflam- 

 mation, or formation of pus, and should heal rapidly. 



26. The cause of tuberculosis. — It is said that one 

 seventh of all the deaths in the world are due to the disease 



Fig. 13. — Dr. Robert Koch, German bacteriologist. 

 Born 1843. Died 1910. 



(From International Encyclopedia. Courtesy of Dodd, 

 Mead & Co.). 



