AND THE CAUSES OF FERMENTATION. 119 
Nature of Fluids. 
E. Weak hay-infusions, urine, 
solutions containing ammonio-cit- 
tate of iron and minute organic 
impurities,* &c, 
F. Solutions of ammonic tar- 
trate and sodic phosphate with 
minute organic impurities, &c, 
G, Weak or strongly acid in- 
fusions, and also many saline so- 
lutions containing organic impuri- 
ties. : 
Nature of Results. 
Same as in the last group, + though 
after weeks or months a dirty- 
looking sedimentary matter 
slowly accumulates at the 
bottom of the flask, which on 
microscopical examination is- 
found to be composed partly of 
Bacteria with Vibriones and 
Lepiothrix, and partly of Tor- 
ule or more thickly-walled fun- 
gus-germs. 
Same as in the last group, only 
the dirty sedimentary matter 
which accumulates never con- 
tains either Bacteria, Vibriones, 
or Leptothrix. Living Torule 
and thick-walled fungus-germs 
in various stages of formation 
are frequently met with, ard 
also, occasionally, a mycelium 
resulting from the development 
of some of these bodies. 
May remain permanently barren, 
and never show any traces of 
organisms either dead or living.t 
* In solutions containing iron, green organisms may subsequently be 
found (see ‘‘ Beginnings of Life,” vol. ii. p. 157). 
+ This, in fact, is in many cases the kind of ehange which the fluids 
a described ultimately undergo. 
t See many negative experiments recorded in ‘‘ The Beginnings ot 
Life,” vol. i. ch. xi. 
Mr. W.N. Hartley has laboured very indus- 
triously to disprove something which I never asserted (see Proceedings 
of Royal Society, vol. xx. p. 140). In my early paper in Mature, I 
expressly stated that organic impurities were always present in the 
saline solutions which I employed ; and, as may be seen by the note 
appended to the conclusions of that paper, I never claimed to have 
