Marvels of insect life ; a popular account of structure and habit . ng the blood is ob\iated. Th(^ circula-tion and renewal of the air in i\\v>v lubes ismaintained h\- a r]i\-thmical distension andcontraction ol the upper and lower walls ofthe hind-bodw wliieh is often ])ereeptible tothe e\(,, and can al\\a\s be detected b\ holding pimtoby] [w. west. an\- largv Insect between finger and thumb. Breathing Mouth ok f>.r , .111 i 11 .1 One of the spiracles seen in the prcctdiiig is Ul course, such a niellUXl does not rtUeW all llie here magnified to twenty-s^-ven t
Marvels of insect life ; a popular account of structure and habit . ng the blood is ob\iated. Th(^ circula-tion and renewal of the air in i\\v>v lubes ismaintained h\- a r]i\-thmical distension andcontraction ol the upper and lower walls ofthe hind-bodw wliieh is often ])ereeptible tothe e\(,, and can al\\a\s be detected b\ holding pimtoby] [w. west. an\- largv Insect between finger and thumb. Breathing Mouth ok f>.r , .111 i 11 .1 One of the spiracles seen in the prcctdiiig is Ul course, such a niellUXl does not rtUeW all llie here magnified to twenty-s^-ven times the natural size, to , . , . , show the fringe of branching hairs by which the air is air at once, as happiiis m the expan>ion and liuered before entry. Pholo by] How Insects Breathe. [W. WUst .\ few of the breathing months, or spiracles, of a water-bcetl •. They are arranged along the margins of the backand covered by the homy wing-covers, which hold a storeof air for their supply. They are here shown magnifiedseven times larger than their actual 140 Marvels of Insect Life, deflation of the lungs ; but it is sufficient, as Insects are not such large con-sumers of oxygen as the backboned animals. Insects are often enclosed intight-fitting tin boxes for many hours on collecting expeditions without anyinjury to their health. IMiall and Denny state that though cockroaches incarbonic acid speedily become insensible, yet after twelve hours exposure tOthe pure gas thev survive and appear none the worse. A caterpillar that hasfallen into water soon becomes flaccid and apparently dead through the entry ofwater into the air-tubes, but if rescued and placed where the water can drain out,will revive, and resume its former activity. Insects such as bees and wasps, whichexhibit an almost ceaseless activity, are affected by close confinement in restrictedair-space much more speedily than the leisurely flying though larger butterfly or main air-trunk extends along each
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecta, booksubjectinsects
