. Towards racial health : a handbook on the training of boys and girls, parents, teachers & social workers. aterpillar life moulting, perhaps, five times. Before moulting, the caterpillar usually retires torather a sheltered part of the leaf, or if being keptin a vivarium2 it fixes itself on the side or prefer-ably the top of the box, resting for a period of abouttwenty to thirty hours before the actual moult takesplace. When it is fully grown, and preparing for itsfifth moult, it fixes itself by means of a silken cord onto some foundation, if out of doors, in some shelteredspot, perhaps under
. Towards racial health : a handbook on the training of boys and girls, parents, teachers & social workers. aterpillar life moulting, perhaps, five times. Before moulting, the caterpillar usually retires torather a sheltered part of the leaf, or if being keptin a vivarium2 it fixes itself on the side or prefer-ably the top of the box, resting for a period of abouttwenty to thirty hours before the actual moult takesplace. When it is fully grown, and preparing for itsfifth moult, it fixes itself by means of a silken cord onto some foundation, if out of doors, in some shelteredspot, perhaps under the corner of the railings, in a creviceof a stone wall. Then it draws itself up, becomes shorterand thicker, somewhat paler in colour, casts its skin,exudes a gummy material from the surface of the body,which gradually hardens into an angular case, one endof which is segmented in a way similar to the cater-pillars body segmentation, the other end having1 See Appendix. 2 See Appendix. 120 NATUKE STUDY marks and folds somewhat resembling the outline ofwings. In this condition it is known as a pupa p or. (All natural size.) The Cabbage Butterfly. A, Male. B, Female. C, Caterpillar on leaf. D, Pupa showingmode of attachment by silken cord. E, Pupa (side view). chrysalis. It is interesting to observe that the coloura-tion of the pupa tends, in some measure, to resemblethe colouration of the foundation upon which it is caterpillars and those of the lesser cabbagebutterfly may be reared in glass-topped boxes lined NATURE STUDY 121 with different colours; for example, one lined with red,one with brown, one with green, and so on ; and as theygo into pupation, one obtains decided differences in thecolour of the chrysalis, each set tending towards theshade of the box lining. This is one way in which thecaterpillar meets the struggle for existence. Thecabbage butterfly passes through two generations ina year. The caterpillars which go into pupation at the endof July (they usu
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