OCR Text |
Show so that the wings of the Insect are Closed As tho atmosphere becomes dryer, it will he found that the butterfly's but-terfly's wlngfi slowly open this Is. of course, simply due to the twisting of tho lower parts of the awns, which pull ovor tho upper portion fastened against tho wings. Probably one of tho most sensitive weather contrivances Is tho foil hygroscopo. hy-groscopo. This consists of three slips of Jeweler's foil thin silver covered on one side with a varnish. The slips should be cut with scissors, and then twisted round a piece of wire until they resemble ringlets. A little framework frame-work Is made, and the three rlnglots |