SYSTEMATIC DESCRIPTION OF SPECIES. 95 



20 to 30/1 long and \ to |/* in breadth; it appears 

 in regular "cork-screws" and in irregular forms. It 

 shows undulating movements, and may be free or 

 attached to the blood-corpuscles. Infection may take 

 place by the bite of the tick, Rhipicephalus decoloratus, 

 and possibly a developmental stage may occur in this 

 host, as direct inoculation did not succeed. 



Theiler also found spirochaetes in horses and sheep 

 suffering from fever, and suggests that these may be 

 the same organisms. He succeeded in inoculating a 

 sheep with the bovine organism. 



Martin found spirochaetes in a sick horse in French 

 Guiana; this form measured 12 to i$/y. in length by 

 \fj. in breadth. 



Baruchello and Pricolo found spirochastes in in- 

 fective pleuropneumonia of horses; these organisms 

 were apparently very small, measuring 3.2^ by 0.5^. 

 They occurred in the spleen, pulmonary alveoli, pleural 

 effusion and blood. They sometimes exhibited terminal 

 granules. 



Heanley found spirochaetes in buffaloes in China, 

 and Martoglio and Carpano found organisms of this 

 nature in sheep. The relationship between all these 

 spirochaetes is doubtful. Dodd believes that the spiro- 

 chaetes met with in the horse, ox, and sheep (called 

 by Nov^y and Knapp Sp. equi, Sp. bovis, and Sp. ovis, 

 respectively) are identical. 



SPIROCH^TES IN THE PIG. 



(Spirochaeta suis?) 



Dodd found spirochaetes in a disease affecting the 

 skin of the pig, communicated by contact and inocu- 

 lable in the skin of a healthy animal. The organisms 

 (Fig. 72) were not found in the blood; they disappeared 



