ARCHIVES DE ZOOLOGIE EXPERIMENTALE ET GENERALE 

 5= Série, Tome III, p. 1 à 26. 

 25 Novembre 1909. 



80ME OBSERVATIONS 



ON LIYING SPIROCHAETES 



FROM 



L.uiiaLii{m^^fiHï( 



BY 



ANNIE PORTER, B. SC. LOND., 



Zoological Research Laboratory, University Collage, Londou. 



CONTENTS 



Pages 



I. Introduction , 1 



II. Material aud Methods 2 



III. Morphology ...,...,...,..., , 3 



IV. Movemeuts 8 



V. Multiplication and Reproduction 12 



a) Division 12 



b) Encystment, etc 16 



VI. Distribution , 18 



VII. Some Effects of Environment 19 



VIII. General Remarks 21 



IX. Summary 22 



REFERENCES TO LITERATURE 24 



INTRODUCTION 



The Spirochaetes considered as a group of organisms con- 

 cerned with the varions forms of relapsing fever which are 

 fatal alike to man and animais, deserve the fullest possible 

 considération, and consequently any v^^ork that deals with the 

 movements and life history of thèse parasites lias a defînite 

 value. Like other Protozoa, for example Trypanosomes, 

 forms of Spirochaetes are known that do not appear to hâve 

 fatal or lethal efïects upon the host that harbours them. Never- 



ARCH. DE ZOOL. EXP. ET OÊN. — j« SÉRIE. — T. in. — (I). 1 



