How to Frost Glass.—­Two ounces of spirits of salts, two ounces of oil of vitriol, one ounce of sulphate of copper, one ounce of gum arabic, mixed together and dabbed on with a brush; or this:—­Dab your squares regularly over with putty; when dry go over them again—­the imitation will be executed.  Or this:—­Mix Epsom salts with porter and apply it with a brush.  Or this one:—­Grind and mix white lead in three-fourths of boiled oil, and one-fourth of spirits of turpentine, and, to give the mixture a very drying quality, add sufficient quantities of burnt white vitriol and sugar of lead.  The color must be made exceedingly thin, and put on the panes of glass with a large painting-brush in as even a manner as possible.  When a number of the panes are thus painted take a dry duster, quite new, dab the ends of the bristles on the glass in quick succession till you give it a uniform appearance; repeat this operation till the work appears very soft, and it will then appear like ground glass.  When the windows require fresh painting, get the old coat off first by using strong pearlash water.

How to Preserve Posts.—­Wood can be made to last longer than iron in the ground, if prepared according to the following recipe:—­Take boiled linseed oil and stir in pulverized coal to the consistency of paint.  Put a coat of this over the timber, and there is not a man that will live to see it rot.

What Diamond Dyes and Paints Are Made of.—­Solutions of the aniline colors.

What the Ingredients Are of Soapine and Pearline.—­They consist of partly effloresced sal soda mixed with half its weight of soda ash.  Some makers add a little yellow soap, coarsely powdered, to disguise the appearance, and others a little carbonate of ammonium or borax.

How Many Thousand Feet of Natural Gas are Equal in Heat-Creating Power to One Ton Anthracite Coal.—­About 40,000 cubic feet.

SUSTAINING POWER OF ICE.

The sustaining power of ice at various degrees of thickness is given in the following paragraphs: 

At a thickness of two inches, will support a man.

At a thickness of four inches, will support man on horseback.

At a thickness of six inches, will support teams with moderate loads.

At a thickness of eight inches, will support heavy loads.

At a thickness of ten inches, will support 1,000 pounds to the square foot.

THE EXPANSIVE POWER OF WATER.

It is a well known, but not less remarkable fact, that if the tip of an exceedingly small tube be dipped into water, the water will rise spontaneously in the tube throughout its whole length.  This may be shown in a variety of ways; for instance, when a piece of sponge, or sugar, or cotton is just allowed to touch water, these substances being all composed of numberless little tubes, draw up the water, and the whole of the piece becomes wet.  It is said to suck up or imbibe the moisture.  We see the same wonderful action going on in nature in the rising of the sap through the small tubes or pores of the wood, whereby the leaves and upper portions of the plant derive nourishment from the ground.