d did not exist ready formed in the tobacco. Now a well-made pastil
should not develope any odor of its own, but simply volatilize that
fragrant matter, whatever it be, used in its manufacture. We think that
the fourth formula given above carries out that object.

It does not follow that the formulae that are here given produce at all
times the odor that is most approved; it is evident that in pastils, as
with other perfumes, a great deal depends upon taste. Many persons very
much object to the aroma of benzoin, while they greatly admire the fumes
of cascarilla.

THE PERFUME LAMP.

Shortly after the discovery of the peculiar property of spongy platinum
remaining incandescent in the vapor of alcohol, the late Mr. I. Deck, of
Cambridge, made a very ingenious application of it for the purpose of
perfuming apartments. An ordinary spirit lamp is filled with Eau de
Cologne, and "trimmed" with a wick in the usual manner. Over the centre
of the wick, and standing about the eighth of an inch above it, a small
ball of spongy platinum is placed, maintained in its position by being
fixed to a thin glass rod, which is inserted into the wick.

[Illustration: Perfume Lamp.]

Thus arranged, the lamp is to be lighted and allowed to burn until the
platinum becomes red hot; the flame may then be blown out, nevertheless
the platinum remains incandescent for an indefinite period. The
proximity of a red-hot ball to a material of the physical quality of Eau
de Cologne, diffused over a surface of cotton wick, as a matter of
course causes its rapid evaporation, and as a consequence the diffusion
of odor.

Instead of the lamp being charged with Eau de Cologne, we may use Eau de
Portugal, vervaine, or any other spirituous essence. Several perfumers
make a particular mixture for this purpose, which is called

EAU A BRULER.

Eau de Cologne, 1 pint.
Tincture of benzoin, 2 oz.
" vanilla, 1 oz.
Otto of thyme, }
" mint, } of each, 1/2 drachm.
" nutmeg, }

Another form, called

EAU POUR BRULER.

Rectified spirit, 1 pint.
Benzoic acid, 1/2 oz.
Otto of thyme, } of each, 1 drachm.
" caraway, }
" bergamot, 2 oz.

Persons who are in the habit of using the perfume lamps will, however
frequently observe that, whatever difference there may be