. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Male Female Fig. 205.—Pediculus pubis, Phthiriusinguinalis or crab-louse. X 17. (From Beattie and Dickson's "A Text-book of General Pathology," by kind permission of William Heinemann, Publisher.) attacks the sleeping host. When handled it feigns death, remaining quiet for so long a time that it is hard to believe it alive. The Ornithodorus savignyi is less adapted to the requirements of the spiro- chseta than its relative. Brumpt* found that t
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Male Female Fig. 205.—Pediculus pubis, Phthiriusinguinalis or crab-louse. X 17. (From Beattie and Dickson's "A Text-book of General Pathology," by kind permission of William Heinemann, Publisher.) attacks the sleeping host. When handled it feigns death, remaining quiet for so long a time that it is hard to believe it alive. The Ornithodorus savignyi is less adapted to the requirements of the spiro- chseta than its relative. Brumpt* found that the spirochEeta did not pass through the eggs of O. savignyi to subsequent generations, and that the inf ectivity of the tick itself soon was lost. The spirochastae remain indefinitely in O. mou- bata, and are passed through their eggs to at least three generations. It is, therefore, difiicult to be certain that any particular tick is uninfected unless its progenitors be known. The spirochseta pass from female to the ovum and infect the young nyniphs as such. The granules observed in the eggs of infected ticks, also occur in those of non-infected ticks and have nothing to do with the spirochseta. II. Lice Lice are apterous insects formerly classed in the order Hemiptera, but now placed in a separate order, the Anoplura. Two genera, and three species are common upon human beings. I. Pediculus (Linn, 1758). In this genus there are two species: I. Pediculus capitis (de Geer, 1778). This is the head-louse. It is of a gray color. The abdomen is composed of eight and not of seven seg- ments as was stated by Piaget, and is blackened along the edges. The * "Precis de Parasitologic," 1910, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McFarland, Joseph, 1868-. Philadelphia and London, W. B. Saunder
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1919
