464 
SpirocJiaeta gallinarum 
spirochaetosis, brought back from Brazil by Professor Marchoux, was 
used ; later, Dr Foley sent a large number of infected Argas persicus 
from Beni-Ounif-de-Figuig, Algeria, with which most of the subsequent 
observations have been made. 
The spirochaete in the foiul. 
The parasites have been examiued in the living state and also in 
stained preparations. For fresh examination the blood film was 
maintained at a temperature of 40° C. by means of a thermostat and, 
by employing dark-ground illumination, the division of the spirochaetes 
could be followed through all its stages. • 
Fig. 1 a-h. Various stages in the flexion and transverse division 
of Spirochaeta gallinarum. 
The details of division seem to differ in some respects from that 
previously described for blood spirochaetes {e.g. Mackinnon, 1909; 
Fantham and Porter, 1909), but resemble that of Gristispira, described 
by Gross (1910), and Spirochaeta anodontae, described by Bosanquet 
(1911). 
