438 
The life history of the spirochaete might be thus summarised 
Just before the crisis the spirochaetes disintegrate, certain of them 
coiling up into skeins, the majority of which are phagocytosed by the 
spleen. Some of them become encysted and break up into very small 
bodies, out of which the new generation of spirochaetes is evolved 
LITERATURE 
1. Breinl and Kinghorn. An Experimental Study of the Parasite of the African 
Tick Fever ( Sfirochala dultoni). Memoir XXI of the Liverpool School of 
Tropical Medicine, 1906. 
2. Novy and Knapp. Studies in Sfirillum obermeieri and related organisms. 
“Journal of Infectious Diseases,” Vol. Ill, No. 3, 1906. 
3. Prowazek. Morphologische und entwicklungsgeschichtliche Untersuchungen 
iiber Hiihnerspirochaeten. 
“ Arbeiten aus dem kaiserlichen Gesundheitsamte,” Vol. XXIII, No. 2, 1906. 
4. Stephens. A Note on the Structure of Sfirochteta dultoni. “Lancet,” 
August 18th, 1906. 
5. Zettnow. Farbung und Theilung bei Spirochaeten. 
“ Zeitschrift fur Hygiene und Infektionskrankheiten,” Vol. LII., Heft 3, 1906. 
Zettnow. Geisseln bei Jliihner und Recurrensspirochaeten. “Deutsche 
Medizinische Wochenschrift,” March 8, 1906, page 276. 
f>. Borrel. Cils et division transversale chez le Spirille de la poule. 
“ Comptes rendus de la Soci6t<$ de Biologie, Tome 60, p. 238, 1906. 
Some forms described in the present paper were observed by this author. 
EXPLANATION OF PLATE 
1 he accompanying drawings were done with a Zeiss apochromatic 
objective 2 mm. aperture r 4 , ocular 18. Drawn to the scale of 4 - 5 ^ 
g 1 to i_. Fiom the peripheral circulation of infected monkeys 
and rats, respectively. 
i ig- 13 —From the liver of an infected monkey. 
HgS ’ 14 to l6 *~ Forms found in the spleen. 
