. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. XI] DEVELOPMENT OF PARASITE 199 At a temperature of 20° to 22° C. the formation of the ookinete and its subsequent development is very greatly prolonged, but the liberation of the microgametes and the process of copulation does not seem to be delayed. If the humidity is lowered to about 40 per cent, the develop- ment of the cysts is prolonged for at least two days, so it seems that a dry atmosphere is relatively unfavourable to the infection of Fig. 53. View of the stomach of a Culex
. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. XI] DEVELOPMENT OF PARASITE 199 At a temperature of 20° to 22° C. the formation of the ookinete and its subsequent development is very greatly prolonged, but the liberation of the microgametes and the process of copulation does not seem to be delayed. If the humidity is lowered to about 40 per cent, the develop- ment of the cysts is prolonged for at least two days, so it seems that a dry atmosphere is relatively unfavourable to the infection of Fig. 53. View of the stomach of a Culex shewing large numbers of the sporocysts of Plasmodium prcecox on its walls. (After Ross.) Neumann kept very large numbers of Cidex and fed them entirely on the blood of an infected canary. Although the majority of these mosquitoes were heavily infected with the Plasmodium, none of them seemed to shew any ill-effects from the presence of these parasites. On the other hand Koch, who similarly fed a number of Culex nemorosus on birds infected with P. prcBcox, found that many of the insects succumbed to the infection. REFERENCES. Grassi, B. (1901). Die Malaria-SUidien eines Zoologen. Jena: Fischer. Koch, R. Ueber die Entwicklung der Malariaparasiten. Zeitschr. f. Hyg. u. Infektionskvankh. vol. xxxii. Neumann, R. O. (1909). Die tjbertragung von Plasmodium pracox auf Kanarienvogel. Arch. f. Proiistenkimde, vol. xiii. pp. 23-69. Ross, R. (1905). Nobel Prize Essay, 1905. Ruge, R. (1901). Untersuchungen iiber das deutsche Proteosoma. Centralbl. /. Bakt. i. vol. xxix. pp. 187-191. Sergent, Ed. and Et. (1907). litudes sur les Hematozoaires d'Oiseaux. Ann. Inst. Pasteur, vol. xxi, pp. 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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