. Marvels of insect life [microform] : a popular account of structure and habit. Insects; Insectes. U2 Marvek of Insect Lite. obvious reason briiiK the ••xclusion of (lust and other minute loreinn matter Irom the air-tubes. In the beetles they are rovered by the edges of tlie winK-eovirs. As the btKly <Dntraets in respiration ttie spiraeles o|x'n ; when it expands tin- spirarles are closed and the air forced by mus<ular pressure into the remot<~l ramifirations of the finest air-tubi'S. In ffyinR Inst'Cts the air-tubes expand ai intervals into oval, elliptii al, or [icar-shajKHl sacs,
. Marvels of insect life [microform] : a popular account of structure and habit. Insects; Insectes. U2 Marvek of Insect Lite. obvious reason briiiK the ••xclusion of (lust and other minute loreinn matter Irom the air-tubes. In the beetles they are rovered by the edges of tlie winK-eovirs. As the btKly <Dntraets in respiration ttie spiraeles o|x'n ; when it expands tin- spirarles are closed and the air forced by mus<ular pressure into the remot<~l ramifirations of the finest air-tubi'S. In ffyinR Inst'Cts the air-tubes expand ai intervals into oval, elliptii al, or [icar-shajKHl sacs, which, of lourse', afford a much larger supply of air than the air-tubes alone, and so increase the breathing i apacit\ necessitated by the (jreater muscular exertion. A former explanation was thai the body was lightened by the extra amount of air in it ; but this is now known to be incorrect, its specific gravity in air not being affected, Baeon-BacUe*. Sir Kdward Coke, the great sixteenth-century lawyer, has dedarid that " tin , house of every one is to him as his castle and fortress, as well for his defence agaiii-i injury and violence, as for his repose," But although we are all fond at time< il boastfully expressing ourselves in the spirit of this legal aphorism, we know th,.t except against the enemies and annoyers that are of our own kind "ur strong wall- and locks are incapable of defending us or ensuring our repose. Numerous enemi. -. A portion of one of thf truiik-lini-« at intcTVab affrMing with thr breathing mouth« tltkworm distant from the si(l<-«. AlR-TL'BES OF THE SiLKWORU. n in a prrvioui phntocraph is here «hown magnj^fted^twelvr tinwi. number o! branch tubM are fivtn ofl, Thew convey a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Step, Edward, 1855-1931. Tor
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1915
