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to be the natural result of an imperfect
or. more accurately, lower
degree of combustibility in the inflammabe|
substance for strong spirit of wine pro-
duced the orange and red rays, while dilu-
ted spirit afforded fine yellow of uniform
intensity. DR.. Brewster says, that the


production Of uniform yellow light from


diluted alcohol. depends partly on the ma
|ture of the wick, and on the rapidity with
which the fluid is converted into vapour.


A piece Of sponge. with number ofpro-
liecting points, answered the purpose OF a
wick better then any other substance; and


the extrication of the yellow is far more


copious by placing common spirit lamp
before the burner of the other. Ifa per-


manently strong light is required, it is pre-


ferable to dispense entirely with the use


of the wick, and to allow diluted alcohol


to descend slowly from the rim of the


lamp into the bottom of concave dish of


platinum, kept very hot by spirit lamp
place under it. The bottom of the dish is


made with number of projecting emf
,lnences. in order that the film of fluid, which
rests on it, may be exposed to many points
d. at once to the action of the heated surface.
1.-THE beautiful effect of this nonochromatif
: lamp, in illuminating microscopic objects,
7 and in various departments Of optics, far
: Exceeded the expectations formed by its
i. inventor. The images of the
e most minute vegetable structures were
o precise and distinct, and the vision, II


every respect, more perfect than it coult
: have been, had all the lenses of the micro
d scope been, made more completely achro
d matte by the most skilful artist.