43 ° The Moths and Butterflies 
cocoon, composed of a single continuous silken thread averaging over 1000 feet 
long, is completed. Inside this cocoon the larva pupates, and if undisturbed 
the chrysalid gives up its damp and crumpled moth after from twelve to fourteen 
days or longer. A fluid secreted by the moth softens one end of the cocoon 
so that the delicate creature can force its way out. But this is not the usual 
fate of a silkworm pupa. The professional grower must save the cocoon 
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