ESSAYS ON BACTERIOLOGY. 67 



Golgi, Kosenbach and others among foreigners, has 

 continued. Eosenbach has shown the interesting 

 fact that the malarial parasite can be kept alive for at 

 least forty-eight honrs in the digestive canal of the 

 leech. 



10. Pnrnlent Pleurisy. — The subject of purulent 

 pleurisy has continued to attract investigation. The 

 result is a tendency to include all, or nearly all, puru- 

 lent plurisies in three groups : First, those due to the 

 Sternberg-Frsenkel pneuraococcus ; second, those ex- 

 cited by the pyogenic staphylococci; third, those due 

 to tubercle bacilli. Microscopic examination or culti- 

 vation or inoculation exp^eriments will show the char- 

 acter of the case; and of this knowledge real, practical 

 clinical use may be made. 



11. Tetanus. — The previously expressed views as 

 to the specific nature of the tetanus bacilli have been 

 confirmed. Every one now believes that the specific 

 bacterial origin of this disease has been established. 

 The most interesting outcome of recent work has been 

 the prevention and cure of tetanus by the use of blood 

 serum or defensive proteids. Mention has already 

 been made of the apparently successful practice of 

 such cure upon men. 



12. Tuberculosis. — Time only increases our ad- 

 miration of the marvelous piece of scientific work re- 

 vealed in Koch's announcement of his discovery of the 

 specific cause of tuberculosis. Time also only adds 

 emphasis to the practical diagnostic value of this dis- 



