264 THE EVOLUTION OF LIFE 
be seen, and the Mould is shown to be commencing 
from a group of refractive particles, very similar to 
what are to be seen in the mid-portions of Fig. 21 
in the next plate. Such particles may be seen also 
in. Plate V., Fig. 15, A and B; in the substance ca: 
the incipient mycelia there represented. 
Results obtacned wrth Saline Solutions which had 
previously been heated in hermetically sealed 
Tubes to 120° C. (248° F*) for ten minutes. 
One of the tubes charged with some of the AA 
solution that had been heated as above indicated, 
was examined after it had been in the incubator for 
six weeks. Numerous groups of Bacteria and 
Micrococci were found in and on the flakes of 
silica, both in small and in rather large aggregates. 
Incipient Moulds were also found, though they 
were rather scarce. A portion of one of the large 
ageregates of Bacteria is shown in Plate VII., 
Fig. 20, and one of the Moulds in Fig. 21. This 
latter was rather a remarkable specimen. It is 
shown in A under a low magnification, in order that 
both the filiform extremities may be seen; while in 
B the greatly expanded median portion, containing 
many refractive particles, is better seen, since it has 
been more highly magnified. 
Another tube, charged at the same time with some 
of the same solution and heated in the same bath, 
was exposed to light rather than placed in the 
incubator. Its contents were also examined at the 
expiration of six weeks, and in the first flakes of 
