236 MICROBES, FERMENTS, AND MOULDS. 
multiply in the 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—tThese 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 Rosenbach 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 
