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88 SCIOPTICON MANUAL. the stage; now with a glass rod, or small brush, dipped in any of Judson's aniline dyes, touch the side of the tank gentty, so as to leave a drop on it. This drop, di- rectly as it touches the alcohol, will go straight down for half an inch or so, and then break out into two branches; these again will break in four, and so on, until by the time the dye gets to the bottom of the tank it will have formed some hundreds of delicate branches. As this action is reversed on the screen, the branches appear- ing to shoot upwards, the effect is much heightened. A (Fig. 28), shows the form assumed. By placing at in- tervals of half an inch drops of different colors, as their branches commingle, the effect reminds one of a shower of different colored rockets. If we now take another tank, and fill it with coal oil, and put a drop of fusel oil into it, we get an entirely different figure, as shown at B. The fusel oil is best colored. CAPILLARY ATTRACTION can be strikingly shown to a large audience. A series of glass tubes of different sizes are fitted into a piece of wood which rests on the top of the tank, and dips down to near the bottom; when the tank is filled with water, which is best tinted, the dif- ferent heights of the water, according to the fineness of the tubes, will be shown clearly on the screen. The curve shown by the liquid rising between two pieces of glass can be shown in the same manner, the colored water forming a pretty gradation of color between the highest and lowest part. CRYSTALLIZATION. —By filling the tank with a satu- rated solution of Glauber's salts, and allowing it to cool, it will appear transparent on the screen, but by dropping one small crystal into it the whole mass will be seen to shoot out into beautiful crystals.