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T. C. Hilgard—Infusorial Circuit of Generations. 21 
“revive” only by starting anew from very reduced, but im- 
mensely multitudinous constituent particles of their own, which 
perdure exsiccation. In the class of Fungi we meet with simi- 
the size of those didymous (érichothecitum) spores which pres- 
ently stand erect on pedicels, as a pink velvet, in the chinks 
of the bark and collapse at the first touch of the sun; while 
their ultimate subcortical development into a mature, “ black 
enamel” Spheeria again perdures in the hea 
Under the circumstances above mentioned, the rain water 
molecular condition, which adapts them to last and survive in 
a dry condition, as we find it not only with the Fungi, but also 
in the case of the pruinose-pulverulent, primitive moss-spawns, 
three agreeing in this feature of being “reducéd to dust,” 
out of which they are again resuscitated. This evanescent con- 
dition, however, where gelatinous particles of about z;';5 of a 
line diameter shrink alike to imperceptible dimensions, affords 
no pretext whatever for assuming identities, just because we 
ourselves lose the means of discrimination. Whenever the iden- 
tity of substance is preserved, each of these yarious molecular 
organisms preserves its cyclar developments distinct from simi- 
ar, corresponding ones as true species, so far as my observa- 
ions go. ge 
There being, at present, no comprehensive pictorial works 
available to fall back upon for reference, that are sufficiently 
correct, even in their designs, to identify the forms, allowance 
must be made for the liberties of comparison taken in the fol- 
lowing descriptive representation of the most frequent infusorial 
processes, : 
