You wish to preserve, for example, one of the great green worms that you find eating your grape-vine. Make an incision across the posterior portion, just sufficient to include the end of the alimentary canal; press the contents of the worm out through the opening, gently, and with special care in the case of the tussock-moth worms and others that have hair or other appendages. Though a seemingly hazardous thing to do (as respects the integrity of the specimen), yet the most delicate hairy caterpillars may be very successfully emptied of their contents.
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