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it as soon after it is filled as possible. If the specimens have been kept for six weeks or so before posting, put a few more drops of creosote on the cotton-wool covering the envelopes. On no account must an excess of creosote be used or it will discolour the insects. If medical creosote or other preventive of mould is not procurable the insects must be kept in wooden boxes only and as free from damp as possible. In very moist climates it may be found nccessary to expose such specimens near a fire from time to time, or place them in the sun, care being taken not to allow ants or other destructive insects to gain access to them.

INSTRUCTIONS FOR COLLECTING AND PRE- SERVING BED-BUGS (CIMICIDAE), COLLECTING.-When a house in the tropics is found to contain bugs, the tops of all the mosquito-nets should at once be examined, as that is a favourite resort for these insects. Bugs may also be obtained, when troublesome, by spreading a broad ring of pyre- thrum powder right round the lower sheet or blanket the sleeper lies; every bug that crosses this to attack him will be upon which found more or less disabled in the morning.

Where fowls are kept, the nesting-boxes should be periodically examined, for these will often be found simply teeming with bugs; and this should always be suspected when the fowls are found to be laying away from their boxes. Bugs are also to be found in some bird's-nests, especially those of swallows. Other specics specially attack bats; these are mostly to be found in the cracks and crannies about the places where bats roost, and can be driven out by the use of ammonia or tobacco smoke; sometimes the insects are found attached to the membrane of the bat's wings, which should always be carefully examined,

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It is quite probable that on fuller investigation different of bugs will be found frequenting the lairs of many other animals.

KILLING. These insects may either be killed in the cyanide bottle or dropped directly in the preserving fluid.

PRESERVING.-Bed-bugs should never be preserved dry; they should be kept in 60 per cent. spirit or 3 per cent. formalin. As far as possible, each tube should contain the bugs from only a single host.

LABELLING and PACKING.-See the instructions given for ticks.

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