Éléments de biologie ; un des éléments pratiques de la biologie ; un texte utile-livre de corréler la botanique, la zoologie et la physiologie humaine elementsofbiolog00hunt Année : [c1907] 2S6 ZOOLOGIE qui jouent des parties importantes ii ? La vie des plantes jouent aussi, dans certains cas au moins, equall}'' des éléments importants dans la formation de la forme et de la structure des animaux. L'espèce. - Le Cecropia cecropia (Samia) peuvent être utilisés pour le travail en laboratoire. Remarque La ressemblance générale de l'espèce. Plusieurs différences peuvent être remarqué, cependant. Le corps est beaucoup plus robustes que celle du papillon. Les ailes et le corps ap- d'avoir une poire thic

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Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 2S6 ZOOLOGY which play such important parts ii? the life of plants also play, in some cases at least, equall}'' important parts in molding the form and structure of animals. The Moth. — The Cecropia (Samia cecropia) may be used for laboratory work. Note the general resemblance to the butterfly. Several differences may be noticed, however. The body is much stouter than that of the butterfly. The wings and body ap- pear to have a thicker coating of hairs and scales. Notice also the feathery antennae. What is the rest- ing position of the wings? When you draw the moth, be sure to show the color markings of the wings. The Egg. — The eggs, cream- colored and as large as a pin head, are deposited in small clusters on the under side of leaves of the food plant. The young are at first tiny black caterpillars, which later change color to a bluish green, with projections of blue, yellow, and red along the dorsal side. Study of Caterpillar. — Captive Cecropias will frequently lay eggs which may be watched in development by placing the young caterpillars in a box with leaves of willow or wild cherry. Watch such an animal, and describe the process of molting. Which end molts first? How do they get out of the old skin ? Is the color of the feeding caterpillars like that of the leaves ? On which side of the leaves do they rest ? How are the leaves held in feed- ing? Are any other parts of the animal besides the jaws used in feeding? The Pupal Stage. — Unlike the butterfly, the moth passes the quiescent stage in a case of silk or other material called a cocoon. The cocoons of Cecropia may be found in the fall on willows or alders. Such cocoons found in meadows or fields are usually larger than those found on the hillsides, probably because of a difference in the food supply of the larva which spun the cocoon. Stu

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