224 PHARMACEUTICAL BACTERIOLOGY. 



or recovery, as pellagra and malaria. Some diseases are very persistent, 

 difficult to eradicate from the system, showing certain effects even to the 

 third and fourth generations, as tuberculosis and syphilis. Malaria leaves 

 certain after-effects, as enlarged spleen ("ague cake"), which may persist 

 through life. 



Savage races are peculiarly susceptible to certain diseases, as tuberculosis, 

 small-pox, gonorrhea and syphilis and peculiarly enough these diseases did 

 not originate with primitive peoples, but with advanced civilization, though 

 of great antiquity. 



