196 



BACTERIA. 



dition, especially in the intestine, although its power of 

 breaking up the albuminoid substances presented to it and 

 of developing its specific toxines is greatly increased, its 

 capability of resisting antiseptic substances is considerably 

 diminished. In plate cultivations made from the organs of 

 typhoid patients, Gaffky found that the bacilli developed in 

 the deeper part of the gelatine as small white points, whilst 



Photo-micrograph of Typhoid bacilli in Lymph follicle of Intestine of a child in 

 which the Typhoid lesions were very characteristic, x 500. 



on the surface they grow as moist-looking greyish colonies 

 with irregular margins. Under a low magnification the small 

 rounded points are seen to be slightly granular ; they have 

 a sharply-defined margin and are of a dirty yellow colour ; 

 the superficial growths, although spreading somewhat 

 rapidly, are thin, sometimes almost transparent, and have a 

 yellowish tinge when seen in the sunlight ; the margin is 



