ORIGIN OF LO WEST OR GANISMS. 8 7 



though there was a very thin pellicle on the surface, and 

 also the dirty-looking crumpled remains of another 

 pellicle at the bottom, which, on examination, was 

 found to be composed of an aggregation of Bacteria. 

 The pellicle on the surface was very thin, and com- 

 posed only of a single layer of Bacteria. In the fluid 

 iiself many Bacteria were seen, of medium size, and 

 mostly sluggish in movement, though a few of them 

 exhibited very active rotatory movements. No I 'ibriones, 

 Leptothrix, or Torulce, were found. 



No. LII. Ammonic Tartrate and Sodic Phosphate 

 Solution after twenty-four hours showed the faintest 

 opalescence ; in forty-eight hours there was a bluish- 

 white turbidity, which, in seventy-two hours, had become 

 more marked. When examined microscopically multi- 

 tudes of Bacteria were found whose movements were 

 very sluggish. On the thirteenth day there was a well- 

 marked whitish turbidity, due to Bacteria and Vibriones, 

 a slight amount of deposit, and a firm pellicle which 

 was found to be composed, almost wholly, of long 

 unjointed Vibriones and unsegmented Leptothrix fila- 

 ments, all of which, when separate, exhibited the most 

 distinct eel-like movements, accompanied by an actual 

 progression from place to place. 



A HI maniacal Solutions, u?ib oiled, and exposed to Air in a 

 Corked Bottle, after Inoculation with a Drop of Fluid 

 containing living BACTERIA and TORUL^:. (Temp. 

 6o-65 F.) 



No. LIII. Ammonic Acetate Solution after twenty- 

 four hours was faintly opalescent, and in forty-eight 

 hours showed a very slight bluish tint. In seventy-two 



