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must frequently be made before the growth of a single
colony can be observed.    To the naked eye the colonies

FIG. 84.—Spirillum of Finkler and Prior, from an agar-agar culture;  x 1000
(Itzerott and Niemann).

appear as small white points in the depths of the gelatin
(Fig.  85).    They, however,  rapidly reach the surface,

FIG. 85.—Spirillum of Finkler and Prior: colony twenty-four hours old, as
seen upon a gelatin plate;   x 100 (Frankel and PfeifTer).

begin liquefaction of the gelatin,   and by the second