. First lessons in zoology. Zoology. 282 FIRST LESSONS IN ZOOLOGY they may contain onl)' air, in which case the)' are trans- parent or whitisli under the microscope, or they may hold small granules of pigment, a colored substance which makes them brown or yellowish or reddish or blackish. Some butterflies have blue or green or purple colors, irridescent and changeable, on their wings. The common. Fig. 219.—Ovvl-butterlly (t'l/A^'c), undcT sidr (Two-thinls natural sizr ; ]ili. .toLjrapli by 11m- auUioi-,) little "blues " have the upper side of the whole wing metallic blue. Examine und
. First lessons in zoology. Zoology. 282 FIRST LESSONS IN ZOOLOGY they may contain onl)' air, in which case the)' are trans- parent or whitisli under the microscope, or they may hold small granules of pigment, a colored substance which makes them brown or yellowish or reddish or blackish. Some butterflies have blue or green or purple colors, irridescent and changeable, on their wings. The common. Fig. 219.—Ovvl-butterlly (t'l/A^'c), undcT sidr (Two-thinls natural sizr ; ]ili. .toLjrapli by 11m- auUioi-,) little "blues " have the upper side of the whole wing metallic blue. Examine under the microscope some scales from one of these blue wings, or from a blue or greenish iridescent spot on any butterfly's wing. The)' will be seen to be not blue or green (as long as light is allowed to come from the mirror of the microscope up through them) but either colorless or of a pale )'ellowish. 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
