. A practical study of malaria. Fig. 21.—Female anopheles. ETIOLOGY 79 Culex larvae have been thawed out of ice in which theywere imbedded and have proceeded to develop into insects, butso far as the writer is aware this has not been done withanopheles. The latter have, however, been found in water. Fig. 18.—Adult culex larva. under a frozen surface. They may exist for a few hours to afew days upon moist mud. The duration of the larval stage varies according to tem-perature, food, and possibly other conditions. The limits maybe placed at from ten to twenty-six days. In warm cli-

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmalaria, bookyear1909