. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. XIl] PERIODICITY 207 within their sheaths, presenting an appearance similar to that shewn in Fig. 54. These are the filariae that one encounters on examining the blood of a filarious patient, and as wih be seen they are merely immature forms and, consequently, it is very difficult to classify them, as the various species are distinguished mainly by the characters of the adults. These embryos are often termed " microfilariae " in order to distinguish them from the mature " filarial,&
. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. XIl] PERIODICITY 207 within their sheaths, presenting an appearance similar to that shewn in Fig. 54. These are the filariae that one encounters on examining the blood of a filarious patient, and as wih be seen they are merely immature forms and, consequently, it is very difficult to classify them, as the various species are distinguished mainly by the characters of the adults. These embryos are often termed " microfilariae " in order to distinguish them from the mature " filarial," but it should be remembered that such a term cannot be used in a generic Fig. 54. ilicrofilarije of F. bancrnfti emerging from the uterus of tlie parent filaria, uncoiling in their chorionic envelopes. (After Bahr, from Filanasis and Elephantiasis in Fiji.) Periodicity. The number of filariae in the peripheral cir- culation presents remarkable periodic variations, a pheno- menon which was first noticed by Manson. In the case of Filaria hancrofti, this author found that, in China, the parasites were present in the peripheral circulation during the night, but disappeared during the day ; and he proposed the specific name nodurna in order to express this habit. Under normal conditions of health and habit, during the day the parasite is. 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 Hindle, Edward, 1886-. Cambridge, University Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectdiptera
