SINGULAR EFFECT OF HEAT.--If a piece of tin foil be wrapped in a piece of platinum foil of the same size, and exposed on charcoal to the action of the blowpipe, the union of the two metals is indicated by a rapid whistling, and by an intense brilliancy in the light which is emitted. If the globule thus melted is allowed to drop into a basin of water, it remains for some time redhot at the bottom: and such is the intensity of the heat, that it melts and carries off the glaze of the basin from the part on which it happens to fall. * * * * * IMITATION OF THE LUMINOUS APPEARANCE OF THE LUNAR DISC.--Introduce a few pieces of phosphorus, of the size of a pea, into a hollow glass ball of three or four inches in diameter; and having heated it to cause the phosphorus to inflame, keep turning the ball around, till half the inner surface is covered with the phosphorus; when the inflammation has ceased, there will be left a whitish crust or lining, which, in a dark place, shines for some considerable time. Enigmas. ANSWERS TO ENIGMAS IN FEBRUARY NUMBER. 4. Memory. 5. Kensington. 6. Eye--I. 7. The parts of speech. 8. Earthquake. * * * * * ENIGMAS. 9. THOUGH formed of what by all is prized, I'm universally despised: Though light[6] myself, I darken you; And though I'm missed, I balk your view. In cities is my favorite haunt, Although afloat I also flaunt: Land travellers e'er rail at me, While sailors wish me in the sea. Yet, spite of all their dire abuse, The wise will deem I serve some use. 10. OF goodness the beginning Am I, you may depend, Although also of sinning Undoubtedly the end. In grief hard-used I must confess, As well as gravity; But softened e'er by gentleness And generosity. Grandees to me give precedence (So prominent in grace): For gold I claim a preference, And guilt also embrace. But greater far than all of these In glory I transcend, And lead the Highest of Degrees The mind can comprehend. 11. THOUGH variable as the wind am I, A steady servant ne'ertheless I prove; By active drudgery your wants supply, And moving frequently, yet ne'er remove. Hard-hearted are my motives; yet you'll own No fairer workman than myself could live; Then I'm a sailor, though a landsman known, And, fairly dealt with, fairest measures give. 12. "Tria juncta in uno." LIKE the leaf of the shamrock, an union of three, On the stalk of humanity flourish should we-- Three blossoms of heavenly beauty and grace, Which you may in the following similes trace.