268 THE EVOLUTION OF LIFE 
examined after the tube had been in the incubator 
for one month. There were many cocci-like par- 
ticles in the flakes which may have been all in- 
organic, as no Bacilli or distinct aggregates of 
Bacteria were seen. A very few Torule, either 
single or in small groups, were found, but there 
were a number of long bent filaments, such as are 
shown in Plate IX., Fig. 26. They had in places, 
and when more highly magnified, an appearance 
suggestive of Streptococcal threads, though they 
were more like what Lehmann and Neumann in 
their ‘“ Principles of Bacteriology” describe as 
‘Torula threads” (de. cz. Pigs ary 
I determined to leave the companion tube in the 
incubator for another six weeks, and then, on exam- 
ination of its contents, these peculiar threads were 
found to be not only much more numerous, but also 
here and there aggregated into much larger masses, 
one of which is shown in Fig. 27. There had, 
therefore, been a considerable growth and develop- 
ment of these threads during the extra time in which 
the tube had been allowed to remain in the incuba- 
tor. There were also a few bodies looking like 
Torulz, either solitary or with a single bud, and 
mostly showing a nuclear particle. Still none of 
them were vegetating, and there were no groups. 
I was not sure, therefore, that they might not be 
inorganic products. 
These tubes charged with the AA solution, which 
had been heated to a higher temperature, and had 
been maintained at that temperature also for a 
longer period than in any of the other experiments 
