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Fig (II V an Female)

II. -0.1. --V.. --an Female Trichostrongylus pergracilis, showing œ, œsophagus; c.gl, cephalic glands; ut, uterus; oj. ovejector; v, vagina; m, mouth; ph, pharynx;r, rectum; an, anus. The uterus contains segmenting eggs. and Dr. Leiper has been able to show that the free larva encysts at a certain stage, and later, leaving its cast cuticle in which it had encysted, rapidly climbs the heather plant, especially in wet weather, and collects on the buds of the heather, the favourite food of the grouse. When we recall the fact that a grouse may contain nearly twenty thousand of these worms, that each worm lays hundreds of eggs, and continues to lay eggs for a considerable period, it will seem