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Updated: July 14, 2025
Open a frog's mouth, and with the back of a knife blade gently scrape a little of the membrane from the roof of the mouth. Transfer to a glass slide, add a drop of salt solution, and place over it a cover-glass with a hair underneath to prevent pressure upon the cells. Examine with a microscope under a high power. The cilia move very rapidly when quite fresh, and are therefore not easily seen.
Moisten one side of a clean lantern slide plate with paraffin and hold it over a candle flame till it is a dead black all over. Very fine tracings can be obtained on the smoked surface if a fine steel point is substituted for the glass pen. The design should be protected by a cover-glass attached to it by a binding strip round the edges. Details of Harmonographs.
From the standpoint of symbolics, the geometric forms and relative positions of cover-glass and microscope suggest allusions to the generative powers of nature like the phallicism of the ancient Egyptian religion, whose sacred emblems of sexual objects still confront the explorer and the tourist.
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