Observations relating to the transmission of sleeping sickness in Uganda, the distribution and bionomics of Glossina palpalis, and to clearing measures / by Aubrey D.P. Hodges.
- Hodges, Aubrey Dallas Percival, 1861-1946.
- Date:
- 1909
Licence: In copyright
Credit: Observations relating to the transmission of sleeping sickness in Uganda, the distribution and bionomics of Glossina palpalis, and to clearing measures / by Aubrey D.P. Hodges. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
10/30 page 8
![Tlie landin<^ or ferry should lie as nearly as possible in the centre of the cleared shore-line, which should extend for at least 250 yards in a direct line, AA, on either side of the eentral point 0.* The road from the shore should pass inland from C at right angles to line AA and should approxi- mately bisect the cleared area. Fi’om each of the points AA a perpendicular line AE should be drawn inland lor 50 yards and the inland extremities of these lines should be joined with a point 1) at least 300 yards along the central road Cl). The whole space thus enclosed should be cleared except for a few shade trees in its central position. There should be no roads or paths connecting with the cleared areas but the road CD, and no communication with it except by this road. At points 50 yards distant ft'om AA and 200 yards from C perpendicular lines should be drawn to meet the lines DE. *^The spaces AEFE should be railed off and should be taboo to all but those actually engaged in the upkeep of clearing or planting, they should be kept absolutely clear or planted with citronella grass. No canoe or other vessel should be allowed to pass within 50 yards of the shore outside the point B. A certain number of shade-trees, but no bush, scrub or long grass, should be left in the central part of the clearing, near the road. If there are no suitable trees, shelters, preferably open sheds at least six feet high at the eaves, may be erected. In the absence of shade natives cannot be prevented from eating, sleeping, etc., in the surrounding jungle. It will be best, where there is considerable traffic, to provide some sort of latrine accommodation in the cleared area. Where tiy are very numerous it will be well to carry the talioo strip along the sides of the clearing to meet the central road at a point 50 yards from D. Figure I represents the scheme in its simple.st form, where the shore- line is more or less rectilinear. Figures II and III show the adaptation of the scheme to shore-lines which are much curved or irregular. Diagram IV illustrates a case in wdrich special modification is required, on account of the curved course which must be followed by ferry boats in crossing a river having a considerable current. The lines Ml represent the river baidv, and the dotted line GH shows the curved course between the points C followed by the ferry boats, which start against the current and afterwards drop down in the slack water near the banks. Clearing must be extended upstream on either l.iank as far as that point where boats are in the habit of approaching to within 50 yards of the laud. It will probably be sufficient in most cases to extend the taboo area, 50 yards deep, to that point. The area of extension is shown by the figures. FAXZ in the diagram. (Signed) A. D. P. Hodges. [Note.]—I think that ■whan our knowledge of breeding grounds becomes systematised much less clearing will be needed. When the breeding grounds are at a distance from the ford or ferry to be rendered fly-free quite a smalt amount of clearing may get rid of the fly; when they are at the spot to be cleared, the destruction of the shade on the bank alone will sufllce. It must, however, be remembered that inadequate clearing gives a false sense of security, and brings discredit on a measure of proved value, and that to allow a cleareil urea to relapse into jungle is many times worse than never to have touched it.—A.G.B. * Vide diagrams.](https://iiif.wellcomecollection.org/image/b2241972x_0012.jp2/full/800%2C/0/default.jpg)
