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SCIENCE PROGRESS 



bacteria. It resembles Cladothrix dichotoma in all respects ex- 

 cept that the threads taper out at the ends. It is described as 

 varying in thickness from 2 ^ at the apex to 5-7^ at the base. 

 When covered with manganese hydroxide, which substance 

 it attracts as well as iron compounds, the thickness of the 



Fig. 8. — Clonothrix fecsca; x i,ooo. 



organism may reach 24 /j,. In view of the fact that it differs 

 from Cladothrix dichotoma only in possessing a tapering apex, 

 and considering that u the latter name is given rather to an 

 assemblage of closely allied species than to a single specific 

 organism, the suggestion may be made that perhaps it would 



