. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. AKIMAL MICRO-PARASITES. 601 blood of a field mouse, and he also mentions that Chaussat found minute " nematodes " in the blood of a black rat. Wittich discovered in the blood of hamsters whip-like bodies with lively movements. They resembled frog's spermatozoa, possessing a thick portion continued into a long lash-like thread. Wittich considered them identical with the organisms described by Lewis, and they al
. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. AKIMAL MICRO-PARASITES. 601 blood of a field mouse, and he also mentions that Chaussat found minute " nematodes " in the blood of a black rat. Wittich discovered in the blood of hamsters whip-like bodies with lively movements. They resembled frog's spermatozoa, possessing a thick portion continued into a long lash-like thread. Wittich considered them identical with the organisms described by Lewis, and they also were observed in apparently healthy animals. Koch later met with the same organisms. Like Lewis, the author found that the blood of the common brown rat in England appeared to quiver with life, and that the parasites were extremely difficult to examine until their movement was arrested for a moment or they became imprisoned in the serum areas. After examining with variotis powers, from a i dry to a -^-g o. i. of Powell and Lealand, the author came to the following conclusion:—That they are polymorphic, presenting for. Fig. 240.—A Monad in Rat's Blood. The organism is represented at partial rest with its posterior filament impinging on a corpuscle, and showing the undulating longitudinal membrane, the long flagellum, and the refractive spherules in the granular protoplasm ( x 3000). the most part slightly tapering bodies which terminate at one end in a stiff, immotile, acutely-pointed flexible filament or spine-like process, and at the opposite end are provided with a long flagellum, whUe, longitudinally attached, a delicate undulating fin-like membrane can be traced, which starts from the base of the posterior filament, and becomes directly continuous with the flagellum (Fig. 240). With careful illumination the body is found to be distinctly granular, with one or more highly-refractive spherules. When the rapid movement is arrested the undulating membrane is distinctly v
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