. First lessons in zoology. Zoology. FIRST LESSONS IN ZOOLOGY long, slender hind body or abdomen, made up of several segments or body-rings ; in flight this hind body acts as a rudder to help steer the dragon-fly in its quick turnings and swift dashes. Note the two pairs of long wings, transparent and delicate, but firmly supported by a com- plex skeleton of longitudinal and cross veins ; no other insect surpasses this one in flight. Note the three pairs of slender ^\ eak legs ; it uses its legs only occasionally for perching, but it uses the U\o front pairs to form a little sort of trap or ba
. First lessons in zoology. Zoology. FIRST LESSONS IN ZOOLOGY long, slender hind body or abdomen, made up of several segments or body-rings ; in flight this hind body acts as a rudder to help steer the dragon-fly in its quick turnings and swift dashes. Note the two pairs of long wings, transparent and delicate, but firmly supported by a com- plex skeleton of longitudinal and cross veins ; no other insect surpasses this one in flight. Note the three pairs of slender ^\ eak legs ; it uses its legs only occasionally for perching, but it uses the U\o front pairs to form a little sort of trap or basket which aids the great mouth in catching and holding small insects when the dragon-fl)' is "hawk- ; Note the great head, so loosely attached to the body behind it that it can be turned in any direction, and can e\'en be so twisted on the neck that the top of the head 'will be direct- ed downward with the mouth facing directly up- -ily. (Fnm. life.) ^^,j^,-j -phis head is com- posed chiefly of two great shining compound eyes each made up of man\' thousand eye-elements. When exam- ined under a good hand lens the shining outer surface of these eyes is seen to be composed of thousands of tiny facets, each facet being the window or transparent outer wall of one of these eye-elements. Each facet and the eye-element behind it see one small part of the object looked at, so that the image produced in the sensiti\-e part of the back' of the e)'e is composed of thousands of separate small parts, which make a sort of mosaic of the object looked at. This seeing by compound eyes,. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
