The prevention of malaria.

  • Ronald Ross
Date:
1910
Catalogue details

Licence: In copyright

Credit: The prevention of malaria. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

    715/768 (page 629)
    and enters habitations at night. Newstead says that it is the commonest Anopheline in the New Forest in England, where the larvae occur in large numbers in the shallow pools and in the cattle footprints. In the marshes of Cheshire it is also abundant, occurring chiefly in shallow, terrestrial waters, sometimes in company with the larvae of Culex. Anopheles formosaensis.—The generic position of this species has not yet been definitely fixed. Incriminated by J. Tsuzuki [1902], who followed completely the development of the malignant parasites in it, but did not inoculate man with it. Occurs in the whole island of Formosa. Tsuzuki apparently distinguishes two varieties, one of which is common in the north and the other in the south of Formosa. Anopheles macultpennis,—Incriminated by the Italians, see under A. bifurcatus ; also by A. Van de Scheer and Van Berlekom [1900J, by Schaudinn [1903], by Hirschberg [1904], Husson [1907], and by Janscd [1904, 1905, 1908], and others. The proof is by complete cultivation of the parasites, and also by inoculation of man by th e Italians and by Janscd. Common and generally distributed through out Europe, including Russia and Scandinavia. It appears also to be generally distributed in the United States of America, and to be common in many parts of Canada. It is chiefly a domestic insect, found in houses, sheds, stables, and hen coops, etc. This habitat also obtains to a very large extent in Great Britain. The larvae occur chiefly in open terrestrial waters in marsh lands, in forests and boggy places. Theobald states that in Britain the food of both sexes is entirely vegetable. Ficalbi, on the other hand, says it is very trouble- some to man in Italy. A. pseadopunctipennis.—Incriminated by S. T. Darling [1910], who found zygotes in four out of thirty-one insects fed on cases of the malignant parasites, and also protospores in the glands of one insect. He thinks that it is only slightly concerned in the transmission of malarial fever in the Canal Zone. Occurs in Panama, Grenada and New Mexico. Darling says that it is one of the two commonest species in the Canal Zone, and breeds in most terrestrial waters. A. larsimaculata.—Incriminated by S. T. Darling [1910], who found zygotes in three out of five insects. Occurs in Panama and South America. It is doubtful if this species is referable to the genus Anopheles.