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it cools very rapidly, especially in earthen vessels; it is therefore clear that the effect will be stronger where the heat is kept up by additions of boiling water, than where the vessel is filled at once, and the fluid suffered gradually to cool. Why is strong infusion of green. lea an efiectual poison for flies Because of the prussic acid it contains.

 Why is coffee so seldom well made in England2

 ! Because, 1st. The berries are overcast ed, their proper color being that of cinna- mon. 2nd. The coffee is ground too fine. Srd. Not enough coffee is used. 4th. Itis usually overlooked, by which means the bit- ter principle is extracted from the berries. Why are we in some measure indebted to the French for our present abundant l supply of cofee2

 .-Because all the coffee grown in the 1 West Indies has sprung from two plants taken thither by French betanist from the botanic garden at Paris. Gu the voy- age the supply of water became nearly ex- hausted, but so anxious was the Frenchman to preserve the plants, that he deprived ! bmself of his allowance in order to water the coffee plants. Formerly coffee could only be got. at great expense, from Mo- cha, Arabia.

 Why do fowls, ifkept confined, lay their eggs without shells?

 Because they cannot get at anyaearth which contains the material requisite for the she'll. Doctor Paris Gin the Linnean Transactions) shows that if the legs of hens be broken they will lay their eggs ] without shells until the fracture is repaired: nature employing all the lime in circulation for the purpose of reuniting the bones. Why are certain small fowls called "ban- tams !''

 Because they were first introduced here l from Bantam, in the isle of Java.

 Why are eggs preserved by rubbing them with butter?

 Because the butter closes the pores in tho shells by which the communication of l the embryo with external air takes place.

 The embryo is not, however, thus killed. Varnsh has a similar effect. Reaumur covered eggs with spirit varnish, and found them capable of producing chickens after two years, when the varnish was care- fully removed.

 Why have white vails a tendency to pro- mote sun burn and freckles? l Because they increase the power of the suns light.

 Why are white hats and dresses worn in summcr2

 Because dark clothes absorb most heat whito therefore repels most heat. and is cooler wear. A white dress in winter is good, because it radiates or receives little heat. Polar animals have generally light furs. White horses are both less heated in the sun, and less chilled in the winter, than those of darker hues.

 Why does flannel covering keep man warm in winter, and ice from melting in summer Because it both prevents the passage of heat from the man, and to the ice. ! Why does person with cold in the head, or catarrh from the eyes or nose, ox- perience so much more relief on applying to the face linen or cambric handkerchief than one of cotton?

 Because the linen, by conducting, rea- dily absorbs the heat and diminishes the inflammation, while the latter, by refusing to give passage to the heat, increase the temperature and pain. Popular prejudice has held that there was poison in cotton. Why is cotton warmer than any other fibrous thread

 Because the flores of cotton, when ex- amined by the microscope, will be seen to be finely toothed. This explains the cause oftheir adhering together with great CT facility than the flores of other species which are destitute of teeth, and which cannot be spun into thread without an ad- mixture of cotton.

 Why does oiled silk, or other air-tight covering. laid on bed, preserve greater warmth than an additional blanket or more

 Because the oiled silk prevents the ven- tilation of the person by the slow passage of air, as through the texture ofthe blanket. Why does worsted differ from yarn? Because separate threads of wool are more twisted for the worsted, of which stockings and stuffs arc made, than for the yarn, of which blankets, carpets, GLc. are made. Worsted was named from it's being originally manufactured in great quantities at Worsted, in Norfolk, once large town, but now reduced to village; the manu- facture being removed to Norwich and it's vicinity.

 Why is woollen cloth advantageous | Because of the readiness with which it allows the precipitation to escape through | its texture, its power of preserving warmth.