LIVING SPIROCHAETES 



11 



Jaffé (1907) has stated that in forward progression through 

 their natural médium, Spirochaetes tighten their coils and so 

 appear to shorten. Then, by a sudden relaxation, they lengthen 



Q Ç\ 



FiGS. 13-24. A séries of reniarkable and beautiful sliapes assunied cousecutively by a spécimen 

 of Spirochaeta anodontae, during a period of twenty-one minutes. 



and so are propelled forwards. Tiiis observation made by Jaffé 

 on S. culicis also holds for S. halhianii and >S'. anodontae, but 

 the niethod is only used by them for progression over very 

 short distances, and is an exceptional movement, by no means 

 common. I, also, hâve observed 8. culicis in the hving condition. 



