Natural history of animals; . ns gold, because some of the pupae are adornedwith golden spots; in the third state it is called a per-fect insect, or imago, from a word which means image,because the image concealed in the skin of the pupahas come forth. These different states are plainlyshown on page 141. Some caterpillars spin a silkencovering, which is called a cocoon,from a word which means a shell;all the silk of the world comesfrom the cocoons of these little creatures. Insects which passFi£. 253.—Cocoon. . . through the changes just de-scribed are said to undergo a complete transforma-tio
Natural history of animals; . ns gold, because some of the pupae are adornedwith golden spots; in the third state it is called a per-fect insect, or imago, from a word which means image,because the image concealed in the skin of the pupahas come forth. These different states are plainlyshown on page 141. Some caterpillars spin a silkencovering, which is called a cocoon,from a word which means a shell;all the silk of the world comesfrom the cocoons of these little creatures. Insects which passFi£. 253.—Cocoon. . . through the changes just de-scribed are said to undergo a complete transforma-tion ; but there are some insects which do not changetheir form so completely. Grasshoppers, for instance,are active during their whole lives, never passingthrough an inactive pupa state. When hatched fromthe egg they have legs, but no wings ; later their wingsbegin to grow, and, at length, having shed their skinseveral times, each time appearing with longer legs andmore perfect wings, they reach their full growth, shed. HYMEXOPTERA : BEES. 143 the skin for the last time, and appear as perfect, oradult, grasshoppers. Such Insects undergo only apartial transformation. Insects are the most numerous of all the classes ofanimals, there being more than two hundred thousandkinds described ; while the undescribed forms are farmore numerous. And the study of Insects is one ofthe most interesting and fascinating in which one canengage. The study of Insects is also very important,that we may know which are injurious to the farm,orchard, garden, granary, and closets, and by knowingtheir habits be able to resist their attacks; and thatwe may know which are of use to man : for the Beegives us delicious honey; some of the Beetles are ofuse to the sick; some of the little Bark Lice, as theCochineal, yield rich dyes; and some of the Cater-pillars furnish all the world with silk. Bees, Wasps, Ichneumons, etc., or Hymenoptera. These Insects have four wings which are more orless transparent, the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
