Measures for avoidance and extermination of flies, mosquitoes, lice and other vermin / by H. Maxwell-Lefroy.

  • Harold Maxwell-Lefroy
Date:
1916
Catalogue details

Licence: Public Domain Mark

Credit: Measures for avoidance and extermination of flies, mosquitoes, lice and other vermin / by H. Maxwell-Lefroy. Source: Wellcome Collection.

    14/26 page 8
    gauze or of paper folded like a filter-paper with a hole at the apex: a bait must be placed in the jar, when flies will enter through the funnel and be unable to escape: a good bait is a banana, some jam or some cornflour,custard powder or similar pudding. 5. In France, the wires removed from baled hay are employed as fly papers by dipping them in the sticky liquid made of resin and oil (page 16) and hanging them up : when they are coated with flies, the wires are removed and wiped, re-dipped and replaced. A suspended wire or string is usually more attractive to flies as a resting place than any other object. Hospital wards, kitchens, single rooms, etc., can be protected from flies by the use of traps, either placed in the windows or in the room. The efficacy of these traps depends on the fact that flies on a convex surface will not find small openings which they will readily discover if approaching them from the concave side. Thus in the diagram below, a fly will go through the opening in the direction from A to B, but not in the reverse direction, see Fig. 1. In this way (1) flies in a room may be Fig. 1. driven out and cannot re-enter if the windows are fitted with suitable screens, or (2) all flies that go out or come in NOTE,—This form of window trap is adapted to sash windows but can be applied to a door, a french window or a hinged window by closing in the space round the trap with wire gauze or mosquito netting. Practically any opening can be fitted with a little ingenuity,
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