STAB-CULTURES. 343 



this method in chapter on Staining) is seen to possess 

 very delicate locomotive organs in the form of fine, 

 hair-like flagella, which are given off in large numbers 

 from all parts of its surface (see Fig. 68). These 

 flagella are not seen in unstained preparations, nor are 

 they rendered visible by the ordinary methods of 

 staining. 



In patients suffering from this disease it has been 

 found during life in the blood, urine, and feces, and at 

 autopsies in the tissues of the spleen, liver, kidneys, 

 intestinal lymphatic glands, and intestines. 



Gelatin Plates. — Its growth, when seen in the 

 depths of the medium, presents nothing characteristic, 

 appearing simply as round or oval, finely granular 

 points. " On the surface it develops as very superficial, 

 blue-white colonies, with irregular borders. They are 

 a little denser at the centre than at the periphery. 



Fig. 69. 



Colony of baeiUrJU typhi abdomituilis on gelatin. 



When magnified, the colonies present wrinkles or folds, 

 which give to them, in miniature, the appearance seen 

 in the relief maps made to represent mountainous dis- 

 tricts (Fig. 69). These colonies have sometimes the 

 appearance of flattened pellicles of glass-wool, and 

 usually present more or less of a pearl-like lustre. 



On Agar-agar the colonies present nothing typical. 



Stab-cultqres. — In stab-cultures the growth is 



