Abstract
IN a previous communication1 it was shown that maturation of the female rabbit flea could be induced by injecting castrated buck or virgin doe rabbits with a commercial preparation of the anterior lobe of the pituitary gland (‘Ambinon B’ Organon Laboratories, London). In Nature the rabbit flea can only mature its ovaries feeding on a doe during the last 10 days of pregnancy, or on new-born baby rabbits during the first 5 or 6 days of life.
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