= 
POLYMORPHISM. 207 
interested observer to this effect. ‘On a preparation preserved 
in a moist chamber, on the third day a white speck was seen on 
the surface, consisting of innumerable ‘yeast’ cells, with some 
filaments, branching in all directions. On the fourth day tufts 
of Penicillium had developed two varielics—P. glaucum and 
P. viride. This continued until the ninth day, when a few of 
the filaments springing up in the midst of the Penicillium were 
tipped with a dewdrop-like dilatation, excessively delicate—a 
mere distended pellicle. In some case3 they seemed to be 
derived from the same filament as others bearing the ordinary 
branching spores of Penicillium, but of this I could not be 
positive. This kind of fructification increased rapidly, and on 
the fourteenth day spores had undoubtedly developed within the 
pellicle, just as had been observed in a previous cultivation, 
precisely similar revolving movements being also manifested.’’* 
Although we have here another instance of Afucor and Penicillium 
growing in contact, the evidence is insufficient to warrant more 
than a suspicion of their identity, inasmuch as the equally 
minute spores of Mucor and Penicillium might bave mingled, 
and each producing its kind, no relationship whatever have 
existed between them, except their development from the same 
matrix. 
Another case of association—for the evidence does not proceed 
further—was recorded by us, in which a dark-coloured species 
of Penicillium was closely associated with what we now believe 
to be a species of Aacrosporium—but then designated a Spo- 
ridesmium—and a minute Spheria growing in succession on 
damp wall-paper. Association is all that the facts warrant us 
in calling it. 
We cannot forbear alluding to one of the species of Spheria 
to which Tulasne t attributes a variety of forms of fruit, and we 
do so here because we think that a circumstance so extraordi- 
nary should be confirmed before it is accepted as absolutely true. 
This refers to the common Spheria found on herbaceous plants, 
* Lewis's ‘‘ Report on Microscopic Objects found in Cholera Evacuations,” 
Calcutta, 1870. 
+ Tulasne, ‘Selecta Fungorum Carpologia,” ii. p. 261, 
