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Show the lime and sets free carbonic acid gas, which blows tp the liquid Into foam, lifts the vessels bodily and causes them to move about in a very eccentric and amusing manner. For a similar reason, if an egg (the shell of which is composed eh'.efly of carbonate of lime) Is put into vinegar. It will begin to turn or spin and will keep on spinning until the shell is entirely dissolved. the pivot on which the magnetic needle is to swing. For a magnet use a short piece of a darning needle permanently magnetized. mag-netized. To adjust it to the pivot savf out of the handle of an old toothbrush tooth-brush a piece of bone about a quarter of an inch square by one-tenth of an inch thick. In the center of the square side bore a hole by means of a knife blade nearly through the piece. The inner extremity of the hole must be perfectly smooth, with no crevices or sharp elges. Attach the magnet to the opposite side of the bone by sealing wax; and after placing plac-ing it on the pivot put the lid on the box. If the hole in the bone be properly prop-erly made, the needle will at once adjust itself, pointing to the north. This compass will be as accurate, for all practical purposes, as one bought in a store, and any boy would take pride in it because he made it j himself. incre wa a mart m our Cn. - Whom pet a 111113 could pleased He even. tok a 3frAa dolikt. To liMt honey betS. Wrapping Paper Magnet. Here is an experiment which can be done quickly and without providing pro-viding yourself with a lot of chemi- cals that you will never want again. Take a piece of ordinary wrapping paper and wet it all over. Then put it near the stove and let it dry. When it is dry put it on a woolen cloth or a varnished table and rub it briskly with a piece of India rubber. In a few moments it will become charged with electricity, and if thrown against the wall or any smooth surface it will stick to it for some time. Tear tissue paper into tiny pieces, not bigger than an eighth of an inch square, and toss them in the air near the sheet. The wrapping paper will draw them to it just as a magnet will attract a needle. Take a tea tray and place on it two or three glasses. Put the electrified electri-fied paper on the tops of the glasses and then touch the tray with your finger. You will be surprised to find that you receive a slight electric shock- by so doing. Now put the wrapping paper on the tray itself and on touching the tray you will get another an-other shock of electricity, but this time of a different kind. Replace the paper on the glasses and you will get the first little ingling again. Birds' Nests. 1 can tell the genus of birds by their nests alone; for instance, a blue jay's nest is like a crow's, and blue jays and crows belong to the same family. Roscoe S. Grant. Bement, 111: This is an interesting observation and shows that Mr. Grant thinks 'while he- looks. That similar habits, not only of nest building, but of feeding, feed-ing, siEging and flying, accompany similar bodily structure is one of the most significant facts in bird history. He would "be a clever . student, however, how-ever, who could classify birds by - - their' nests alone, and yet make his Maze. Can you find your way to the center cen-ter without crossing a line? . accepted. With what family would - . - he class the bluebird, judging from w - Its nest in a hollow tree or post? Or . . .. .; how f.rom its nest would he associate :, . tlje oriole" with the bobolink or blaek-' blaek-' bird? "' ;'- " On the Other hand, the nests and ' -""Vhite enameled eggs of woodpeckers " ' afford one of the roost striking in- stances of that racial similarity noted : ; ? ; yhy, -our . correspondent. The Ameri-. Ameri-. ; :an JBoy. How to Make a Compass. Any ingenious boy can make a good compass at no cost in money and at little cost in patience. Get from a druggist a common pasteboard pill box, about an Inch and three-quarters in diameter. Cut in the lid a round hole an inch in diameter, and cover this hole on the inside with a piece of thin window glass, which can be held in place by bits ot sealing wax at the corners. Break off about three-eighths of an inch of the point end of a sewing needle, and affix it, point upward, by "I -, . Floating Needles. : Having first filled a bowl with ' .cold water, take an ordinary sewing needle and rub It on a piece of woollen wool-len cloth until It is warm. Taking it carefully between the thumb and forefinger, you may put it on the top of the water and it will remain there if not jarred. Take more needles and rub them as you did the first, place them also carefully, one by one, on the water, and they will form themselves- in a line beside the first. On the surface of every liquid i6 a thin film, and it Is on this film that the needles in this experience are held, and it Is only when this film is broken that the needles fall to the bottom of the bowl. Race at the Zoo. The" animals thought they would nave a race; The Monkey was referee; The Bull was stakeholder, for, as he said, It was his nature to be. The Camel got a h'mo on himself; The Lioii run' v' " 'inignt 'S.iZi'TbSet-The 'S.iZi'TbSet-The Tiger stood off, for a beast of his stripe Was not let to enter again. The Elephant took his trunk along. In case he won the prize; The Peacock was starter, and missed no one, For, you see, he was all eyes. Some spotted the Leopard for winner sure; . The old ones chose the Gnu; While those who leap to conclusions quick Bet on the Kangaroo. The Ostrich plumed himself on his speed; All tried the record to wreck; The Hippopotamus blew his own horn. But the Giraffe, he won by a neck. Baltimore American. Queer Name for Rock Crystal. The East Indians called rock crystal crys-tal an unripe diamond. 2 A-BOX. . C-MA&rHfcT. I 3-"fcMVOT. -D- COVER.. Parts of a Compass. means of sealing wax to the center of the bottom of the box. This is to be A Naval Battle on a Table Top. Here is a fleet of war vessels that you can make yourself and that go of themselves after a fashion. The vessels ves-sels are carved out of lumps of chalk and furnished with military masts, 13-inch 13-inch guns and anything else that may be needed to give them a formidable for-midable appearance. The more you have of them the . better, but they need not be large, nor is it necessary to hollow them out or provide them with decks. They differ from real battleships in one other respect, for they are flat-bottomed. The ocean which they navigate is a large platter or pie dish, which is empty until the commencement of the naval review or engagement Then you pour in just enough vinegar vine-gar to cover the bottom of the dish. In an instant everything Is in commotion. com-motion. The little cruisers and battleships bat-tleships rush hither and thither as if they were attacking each other or going through complicated evolutions. evolu-tions. They rise and sink like ships iji 1 1' 11 j Lunii' 'LIU " "! Ci im'Ofl PUZZLE. Where l the Spy They re Hunting For? jn a storm and each is surrounded by a mass of foam, as if they were churning the water vigorously. It is great fun for the little ones and interesting to those who are not so little. The movements of the vessels and the foam that surrounds them are caused by the chemical action of the vinegar upon the chalk of which they are composed. Chalk in carbonate of lime. The sold of ! vinegar combines with |