. Agriculture for southern schools. t will be smallerin size than usual. The pupa, ox pupal stage, occurs onlyamong insects in which the larva is very different from theadult. It is purely a tmns-fonnatiou stage, and is oneof the most wonderful factsin the life of any animal. Transformation from cater-pillar to butterfly. — Whenthe butterfly caterpillar hasbecome fully grown, it ceasesto feed and seeks some pro-tected spot in which to trans-form. For a time it seemsto shrink or shrivel as thoughabout to die. The most won-derful thing, perhaps, is thatthrough all the vital changesthat take plac
. Agriculture for southern schools. t will be smallerin size than usual. The pupa, ox pupal stage, occurs onlyamong insects in which the larva is very different from theadult. It is purely a tmns-fonnatiou stage, and is oneof the most wonderful factsin the life of any animal. Transformation from cater-pillar to butterfly. — Whenthe butterfly caterpillar hasbecome fully grown, it ceasesto feed and seeks some pro-tected spot in which to trans-form. For a time it seemsto shrink or shrivel as thoughabout to die. The most won-derful thing, perhaps, is thatthrough all the vital changesthat take place within its body during this period it Cour,e,y U. S. Bur. En.„n,oIogy , FiG- 166.—Breeding Cage does not die. After a tew cage used to confine insects when study-days, the caterpillar sheds ing thdr larval skin and becomes the pretty, shining chrysalis,ox pupal case, of the butterfly. This is generally attachedto some twig or stem. The surface is marked withdelicate lines which really indicate the outlines of the. 252 AGRICULTURE sheaths within which the wings, legs, and antennae aredeveloping. The body of the made over intoan entirely new set of structures especially fitted for thedifferent life the adult will lead. A wonderful changetakes place in both the structure and the habits during thetwo stages of these insects lives. A new butterfly isformed out of the body of the old caterpillar without de-stroying its life. This is just what happens with mostinsects. With moths the changes are very similar, onlythey are hidden from view by the cocoon, or silken case,that the caterpillar spins around itself for protection dur-ing this critical time of life. The change with wasps andbees and beetles is just as great as with butterflies andmoths. Exercise. — Bring some potato beetles to the school and confinethem in a cage such as shown in Fig. l66, with some of the potatovines. Watch the adult beetles lay their eggs and the young hatchand grow. Have
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