102, * THE EVOLUTION OF LIFE 
infusions of turnip with cheese, whether neutralised 
or not, would be found by that time to contain 
multitudes of Bacteria, and that the other two 
undiluted turnip infusions would exhibit obvious 
changes. In the hay infusions, he expected that the 
process would not advance so rapidly ; the diluted 
infusions, he thought, would remain permanently 
unaltered. The results in each case were as 
follows :— 
(a) Neutral turnip infusion with cheese.—On the 
16th I observed that the liquid had become turbid ; 
on the 17th the turbidity was very obvious. Before 
opening the retort it was ascertained that when the 
blow-pipe flame was directed against the tube the 
heated part was drawn inwards, and further, that 
when the retort was inclined with its bulb upwards, 
so as to allow the liquid to rush against the closed 
end, a characteristic water hammer sound was pro- 
duced. On breaking the point air rushed in with a 
tolerably loud sound; the liquid was crowded with 
moderately sized Bacteria, which exhibited active 
progressive movements. There were also Leptothrix 
filaments. 
(6) Unneutralised turnip infusion with cheese.— 
On the 17th, the retort, having been tested in the 
same way as before with similar results, was opened. 
It contained no living forms. 
(c) Neutral turnip infusion without cheese.—On the 
17th this liquid exhibited no marked change. It 
was finally examined on the 31st, and found to be 
still unaltered. 
(dq) Unneutralised turnip infusion without cheese. 

