236 MIOEOBES, FERMENTS, AND MOULDS. 



multiply in tlie blood, they must necessarily have an 

 irritating effect on the walls of the blood -capillaries 

 and this appears in the swelling of the cells and their 

 return to the spherical form ; in a word, they are 

 transformed into embryonic or migratory cells (accord- 

 ing to Cohnheim's theory). These do not differ, or 

 only differ slightly, from the colourless corpuscles of 

 the blood, and are pus-corpuscles. This new theory 

 is in accordance with the facts daily presented to us 

 in the treatment of surgical diseases. 



XVI. Microbes of some other Diseases, resulting 

 FROM Wounds. 



Whitlow and Agnail. — These two complaints are 

 produced by pricking the finger with some instru- 

 ment charged with microbes. Chains of bacteria or 

 micrococci are always found in the collection • of pus 

 or serous discharge. 



Boil and Carbuncle. — The pus from a boil contains 

 micrococci, which Pasteur first observed, and which he 

 has cultivated in an infusion of yeast and in chicken- 

 broth. 



It was found by Eosenbach in osteomyelitis, and 

 was termed by him Staphylococcus pyogenus aureus 

 (Fig. 99). 



Carbuncle only differs from a boil in its larger 

 size, and contains the same microbe. It is well known 



