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.
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![He was acquainted with Manson's researches on the develop- ment of Filarin bancrofti in mosquitos.1 In 1883 Dr A. F. A. King wrote an able paper on the subject [1883] in which he gives no less than nineteen reasons why mosquitos are likely to carry paludism. These are:—(1) that both paludism and mosquitos are connected with marshes; (2) that they both require a temperature of over 60 degrees F.; (3) are checked at freezing point; (4) abound most near the equator and sea-coasts; (5) have an affinity for dense foliage ; (6) can be screened off by trees ; (7) can be transported by winds ; (8) are encouraged by turning the soil ; (9) are affected by bodies of water; (10) are diminished by cultivation and settlement; (11) keep near the surface of the ground; (12) abound most after sundown; (13) and in the open; (14) are destroyed by fires ; (15) are not so common in cities ; (16) are most prevalent in autumn ; (17) are arrested by mosquito nets ; (18) affect infants (which are generally protected by nets) less than adults; and (19) attack whites more than other races. This was by far the best exposition yet given. Though arguments (4), (13), (14), (18), and (19) are not sound, while arguments (5), (6), (7) are very doubtful, and though the most cogent argument of all was not known to him, the cumulate effect of his careful and well-arranged reasoning was very strong. Like Beauperthuy, he held that the insects bring the poison from the marsh and inoculate it by their bites. He was acquainted with Manson's work, but not with Laveran's. His paper was speedily lost sight of, and was not resuscitated until my researches had cleared up the question. About the same time Laveran suggested the same idea [1884, p. 457] in a short sentence: Do mosquitos play the same role in paludism as infilariasis ? he said. The thing is not impossible, and we must note that mosquitos abound in all marshy places. 1 For further details see the interesting book, Mosquito or Man, by my colleague, Sir Rubert Boyce. John Murray, London, 1909. B](https://iiif.wellcomecollection.org/image/b21351600_0041.jp2/full/800%2C/0/default.jpg)
