. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 562 Plague is common everywhere as is Pulex irritans, the human flea. It is likely that any or all of these engage in plague transmission when once an epidemic has started, but the most active vector of the disease, the world over, and the most important agent in starting human epidemics of plague is Xenopsylla cheopis. Much interesting and valuable information concerning the biology, bionomics. Fig- ^33-—Various fleas, magnified about 30 diameters. The
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 562 Plague is common everywhere as is Pulex irritans, the human flea. It is likely that any or all of these engage in plague transmission when once an epidemic has started, but the most active vector of the disease, the world over, and the most important agent in starting human epidemics of plague is Xenopsylla cheopis. Much interesting and valuable information concerning the biology, bionomics. Fig- ^33-—Various fleas, magnified about 30 diameters. The specimens are treated with hot 20 per cent, caustic potash for a few minutes, dehydrated in alcohol, cleared in xylol and mounted in balsam, a, Pulex irritans, cf; b, Pulex irritans, 9 ; c, Xenopsylla cheopis, cf; d, Xenopsylla cheopis, 9 (Bacot, in Journal of Hygiene, "Plague Supplement in, 1914"). and relation of rats and fleas to plague, will be found in the " Reports of the India Plague Commission" many of which are to be found in the "Journal of Hygiene," vols, i-xrv. The following illustrations and tabulations will enable the student to identify the common genera of fleas. For more intimate systematic study he must be referred to "A Text-book of Medical Entomology," by Patton and Cragg.* * " Christian Literature Society of India, London, Madras and Calcutta," 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. Saunders Company
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