The American monthly microscopical journal . aqueous magenta. Thehighest available powershould be used. + The paper of Miibius already cited deals mainly with the thread-cells of Caryophyliia, which do not possessthe three large barbs ; but his figures and brief description of the barbed of Hydra show that heclearly understood their action. It may be added that nearly fifty years ago Erdl published recognizable figuresof these thread-cells, both before and after discharge, and he seems to have understood the action of the pyramid( Pfeil), though he fell intp tjie error of supposi
The American monthly microscopical journal . aqueous magenta. Thehighest available powershould be used. + The paper of Miibius already cited deals mainly with the thread-cells of Caryophyliia, which do not possessthe three large barbs ; but his figures and brief description of the barbed of Hydra show that heclearly understood their action. It may be added that nearly fifty years ago Erdl published recognizable figuresof these thread-cells, both before and after discharge, and he seems to have understood the action of the pyramid( Pfeil), though he fell intp tjie error of supposing it to be capable of repeated action by withdrawal into thesac after discharge, / 1888.] MICROSCOPICAL JOURNAL. 81 Soap-bubble solutions and a slide for observing soap-bubble films.* By F. T. chapman, WASHINGTON, D. C. A simple means for showing soap films, by means of the microscope, mayconsist of a thin strip of wood (3 in. by i in.) , or other material, with a metalplate secured to it. The plate should have one end bent upward from the. Fig. I.—Slide for Soap Films. strip, at an angle of about 45^, and have a square hole through it. The filmincreases in brilliancy as it grows thin. The light should be thrown on thefilm from above, so that the beam will be reflected up the tube of the instru-ment. The proper angle can readily be found by trial. Following are some directions for making soap-bubbles :— I. Shave Marseilles (castile) soap and drv thoroughly in the sun or on astove. IL Put the dried shavings of soap in a bottle with alcohol of exactly 8oostrength (specific gr. ), sufficiertt to form a saturated solution at 60^Fahr., the solution then marking 74° on the centesimal alcoholometer, witha density of The solution must be made cold, as warm alcohol wooilddissolve too much soap, and the solution would solidify when cool. IIL Make a mixture of glycerine and water, so as to mark ° Baume,or have a density of at 68° Fahr. This solution can be mad
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmicroscopy, bookyear1
