x] BACILLI : SPECIAL 303 



threads of the cladothrix gave rise to micrococcus, bacte- 

 rium, bacillus, and spirillum ; and further that each of 

 these is again capable of growing into the threads of the 

 cladothrix. 



{c) Beggiatoa. — In stagnant water, particularly in sulphur- 

 containing water, peculiar oscillating colourless threads are 

 met with of the thickness of o'oooi to o-oi6 mm. ; they 

 contain highly refractive granules, which Cohn {Beitrage zur 

 Biol. d. Pfl. i. 3) has shown to be composed of sulphur. 

 After dissolving these granules it is seen that each thread is 

 septate, being composed of a sheath and transverse septa at 

 regular intervals, by which the threads appear made up of a 

 series of short cylindrical elements. There are a number 

 of species varying from one another in the thickness of the 

 threads. 



