An American text-book of the diseases of children .. . ntain spores ; vacuoles havebeen mistaken for them. In the vomit and intestinal contents of the attackedthe comma forms are always present for a number of days, and short andincomplete spirils may sometimes be demonstrated in smear-preparations. The comma bacillus of Koch multiplies commonly by two modes, each ofwhich, however, constitutes essentially a process of fission: a, the commadoubles its length, and then divides into two ; 6, before dividing the commacontinues its elongation into a longer or shorter spiril filament, which ulti-mat
An American text-book of the diseases of children .. . ntain spores ; vacuoles havebeen mistaken for them. In the vomit and intestinal contents of the attackedthe comma forms are always present for a number of days, and short andincomplete spirils may sometimes be demonstrated in smear-preparations. The comma bacillus of Koch multiplies commonly by two modes, each ofwhich, however, constitutes essentially a process of fission: a, the commadoubles its length, and then divides into two ; 6, before dividing the commacontinues its elongation into a longer or shorter spiril filament, which ulti-mately becomes segmented in order that finally the segments may separate toform new and separate commas. Of these two processes of multiplication, theformer is by far the more rapid. Elongation and division of the one commainto two have been actually observed under the microscope to take place intwenty minutes. With such a rate of multiplication demonstrated, one caneasily form some adequate conception of the otherwise inconceivable rapidity of PLATE IX. Fig. 1. Photo-micrograph: Smear preparation from pure culture of comma bacillus of Koch. X 1300Fig. 2. Photo-micrograph: Smear preparation from (old) pure culture in gelatin of c<»mma bacillus of Koch, showing oogonia of Ferran or involution forms of other 3. Phot--micrograph : Gelatin-plate colony of comma bacillus of 4. Photograph: Gelatin tube-culture of comma bacillus of Koch, 72 hours old, surface inclined. Natural size. CHOLERA ASIATICA. 255 propagation and enormous power of dissemination In river-water of the specificinfectious principle of Asiatic cholera contained in the discharges from the bowelsoi a tiw cases, numerous examples of which the history of this disease affords ;one of the most Btriking being the most recent—namely, that of the river Elbein 1892. Of other possible modes of multiplication, only two may be merelymentioned here: that by intervention of so-called arthrospores of Ilupp
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Keywords: ., bookcentury1800, bookdecade189, booksubjectchildren, bookyear1895
