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SMUTS. 77
liis hands and clotliing became dusted with this
powder and if at the time he should have been clad
;
in sombre black, evidence will have been afforded
— in the rusty-looking tint of the powder when
—
sprinkled upon his black continuations that, however
sooty this powder might appear whilst still
adhering to the ears of corn, it has an evident brown
tint when in contact with one^s clothes. This
powder, minute as it is, every granule of it constitutes
a spore or protospore capable of germination,
and ultimately, after several intermediate stages, of
reproducing a fungus like the parent of which it
formed a part. During the growth of the plant its
virulent contents flow like a poison through the
innermost tissues, and at length attack the peduncle
or axis of the spikelets of the ear, raising up the
essential organs and reducing them to a rudimentary
state. Brongniart, who made this species the
special subject of observation, states that the fleshy
mass which is
occupied by the fungus consists
entirely
of uniform tissue, presenting large, almost
quadrilateral cavities, separated by walls, composed
of one or two layers of very small cells filled with
a compact homogeneous mass of very minute granules,
perfectly spherical and equal, slightly adhering
to each other, and at first green, afterwards
free or simply conglomerate towards the centre of
each mass, and of a pale rufous hue at ; length the
cellular walls disappear, the globules become completely
insulated, and the whole mass is changed