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MICROSCOPICAL PHENOMENA OF DECAY. 185

longer possible to distinguish the separate tubules; we then see
only irregular masses of bacteria, of ditferent sizes, which are
more or less contaminated l)v the detritus (debris) of the de-
composing dentine. These impure masses are wh.it Abbott

LOXGITUDIXAL SeCTIOX OF DECAYED DeXTI.VE SHOWING INFECTION WITH ROD- AND
Thread-Forms, a, tubule distended, but walls still comparatively intact: h, d. tubular walls
broken through and the dent ine in a state of complete dissolution ; c, tubules out of focus. Circa
500 : 1.
calls " embryonic elements." Since they are not homogeneous,
they take up the coloring-matter unequally at ditferent points,
and therefore occasionally present ligures that may bear a certain
faint resemblance to cells.