96 SPIROCH^TES. 



and reappeared in the cutaneous lesions from time to 

 time. 



Cleland observed spirochaetes in tumours occurring 

 at the site of castration in pigs. The organisms were 

 from 6 to i2/x in length and exhibited three or four 

 irregular curls. Along with these organisms were large 



FIG. 72. Spirochaeta suis. (After Dodd.) 



bacillary forms, some of which were slightly undulat- 

 ing and suggestive of being modified forms of the 

 spirochaetes. 



SPIROCELETA LAVERANI. 



(Breinl and Kinghorn, 1906.) 



These organisms, found in mice by Breinl and King- 

 horn, measured from 1.8 to 3.75^ in length, and o.i 

 to 0.2/4 in breadth. They had pointed ends (one more 

 so than the other) and one to four curls. They were 

 transmissible by inoculation, with an incubation 

 period of five days. Transmission by fleas and lice 

 was not effected. The mice showed enlargement of 

 the spleen. 



SPIROCHAETA MURIS. 



(Wenyon, 1906.) 



Found by Wenyon in mice, this organism (Fig. 73), 

 is from 3 to jn long and 2/1 broad. It has no undulat- 



