68 ORIGIN OF LOWEST ORGANISMS. 



marked, and there was also a certain amount of sedi- 

 ment. 



No, III. Turnip Infusion in twenty-four hours showed 

 a very slight degree of turbidity. A drop examined 

 microscopically revealed a number of very minute, but 

 very active, Bacteria. In forty-four hours the turbidity 

 had become very well marked. 



b. Fluid in contact with Ordinary Air and its Particles ; 



Neck of Flask Sealed after the Fluid had become Cold. 



No. IV. Urine remained quite bright and clear during the 

 fifteen days in which it was kept under observation in 

 the water-bath.* 



No. V. Hay Infusion after forty-four hours showed a 

 well-marked turbidity. In sixty-eight hours there was 

 an increase in the amount of turbidity, and also some 

 sediment. During the next forty-eight hours turbidity 

 and sediment gradually increased, whilst the colour of 

 the fluid (originally that of port wine) became several 

 shades lighter. Except that it grew still lighter in 

 colour, and that the amount of sediment increased, it 

 underwent no further obvious change during the fifteen 

 days in which it remained in the bath.* 



No. VI. Turnip Infusion underwent no change during 

 the fifteen days in which it was kept in the bath under 

 observation.* 



c. Fluid in a Flask with a Neck two feet long, and having 



Eight acute Flexures. 



No. VII. Urine remained quite bright and clear during 

 the fifteen days in which it was kept under observation 

 in the water-bath.* 



* Flask still in my possession, unopened. 



