The deliquescence of the naphthaline cones produces a blackish, oily residuum which will soil the lining of the box, and it is always advisable either to pin a piece of blotting paper beneath the cone or to wrap this in paper.
I, page 63) that in place of these cones a form of naphthaline may be used which is known in commerce as "white carbon," and is put up in the form of small square rods for use in intensifying the flames of gaslight.
Where tight boxes are employed little fear of the work of these destructive agents need arise, especially if the boxes are kept supplied with repellent naphthaline cones.
Carbolic acid is recommended, but Mr. Ashmead, who has kept a large collection in the moist climate of Florida, has found the use of naphthaline much more satisfactory.
The use of naphthaline cones is not advisable in boxes containing delicate specimens, as it leaves a deposit which dulls the colors and encourages greasing.
The conviction has been forcing itself on my mind for some time that the naphthaline cones tend to promote greasing and verdigris, and carbolic acid in some small vessel secured to the cork, were, perhaps, preferable.
Naphthaline cones act as repellents to these insects and also to some extent retard the development of the larvae in all stages and particularly of the eggs.
Rearrange your specimens where necessary, and see that all are properly labelled; remove all greasy specimens, and deal with them as recommended on page 127; also renew the supply of camphor or naphthaline in your drawers and store boxes.
The first object can be attained by always keeping camphor or naphthaline (albo-carbon) in each division.
Naphthaline crystals or camphor is generally employed to keep out insect pests from boxes.
Naphthaline is prepared in the form of cones attached to a pin, and these cones may be placed in one corner of the box.
A few balls ofnaphthaline placed in it will tend to keep away mites and other pests.
Naphthaline crystals and camphor may be secured in the corner of the box by tying up a quantity of them in a small piece of netting and pinning the little bag thus made in the corner of the tray.
The pocket is kept filled with naphthaline crystals, the fumes of which pass into the interior and tend to keep away pests.
They are very useful to deter the entrance of pests, but when they have once been introduced into a collection neither naphthaline nor camphor will kill them.
The best method for the making of such a determination is probably the burning of a definite amount of resublimed naphthaline whose heat of combustion is known.
In testing any fuel where it is found difficult to completely consume a sample, a weighed amount of naphthalinemay be added, the total weight of fuel and naphthaline being approximately one gram.
The heat evolved in burning of a definite weight of standard naphthaline may also be used as a means of calibrating the calorimeter as a whole.
Naphthaline crystals destroy mites and they cannot exist where it is abundantly present.
At presentnaphthaline in the form of crystals has become the most popular of the various volatile poisons, and among ornithologists, mammalogists, and entomologists is very generally used.
A half-ounce bag of naphthaline crystals will last about three months.
The best for this purpose is naphthaline crystals, exposed in the cases in little bags made of musquito-netting, used in abundant quantity, and left in the cases, which must of course be kept closed as tightly as possible.
Naphthaline in crystals may be introduced among the envelopes, and this appears in many cases to serve as a partial preventive of mould.
I began by sprinkling naphthalinein the room intended for the reception of the males that evening.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "naphthaline" in a variety of sentences. We hope that you will now be able to make sentences using this word.
