Untitled7. The motor nerve-fibre ends on a muscle-fibre (M.F.) near the surface.This moves and the reflex action is complete.][Illustration: _Photo: British Museum_ (_Natural History_).THE YUCCA MOTHThe Yucca Moth, emerging from her cocoon, flies at night to a Yuccaflower and collects pollen from the stamens, holding a little ball of itin her mouth-parts. She then visits another flower and lays an egg inthe seed-box. After this she applies the pollen to the tip of thepistil, thus securing the fertilisation of the flower and the growth ofthe ovules in the pod. Yucca flowers in Britain do not produce seedsbecause there are no Yucca Moths.][Illustration: INCLINED PLANE OF ANIMAL BEHAVIOURDiagram illustrating animal behaviour. The main line represents thegeneral life of the creature. On the upper side are activities implyinginitiative; on the lower side actions which are almost automatic._Upper Side._--I. Energetic actions. II. Simple tentatives. III.
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