The laws and mechanics of circulation, with the principle involved in animal movement . in thelips would not seem excessive ; nor the grouping of the radi-ating fibres into separate muscular bundles be deemed strange,the matter being altogether different from the simpler actionin the iris, in which the radiating fibres form a uniform layerfor producing the action in the screen concerned in openingand closing the pupil. At the same time, it is equally mani-fest that the same mechanical principle applies for producingthe movements. We pass rapidly over this anatomy, the object being toshow the p
The laws and mechanics of circulation, with the principle involved in animal movement . in thelips would not seem excessive ; nor the grouping of the radi-ating fibres into separate muscular bundles be deemed strange,the matter being altogether different from the simpler actionin the iris, in which the radiating fibres form a uniform layerfor producing the action in the screen concerned in openingand closing the pupil. At the same time, it is equally mani-fest that the same mechanical principle applies for producingthe movements. We pass rapidly over this anatomy, the object being toshow the principle in the mechanics simply, leaving the DUALISM DEMONSTRATED. 483 student to follow it at his leisure. By beginning with a prin-ciple upon which to base the mechanics, and proceeding fromthe simpler to the more complex forms, the comprehensivearrangements which obtain in the organs are seen to be but asmany beautiful adaptations of means to ends, while order andmethod are made inevitable. In the orbicularis palpebrsB(4) we have another adaptation of the mechanics in the orbic-. Pig. 201. —Muscles of the Head and Face.—Wilson and Buchanan. 1, Frontal portionof the occipito-frontalis ; 2, its occipital portion ; 3, its aponeurosis ; 4, orbicularispalpebrarum, which conceals the corrugator supercilii and tensor tarsi; 5, pyra-midalis nasi; 6, compressor naris ; 7, orbicularis oris ; 8, levator labii superiorisalaeque nasi—the adjoining fasciculus between ciphers 8 and 9 is the labial portion ofthe muscle ; 9, levator labii superioris proprius—the lower part of the levatoranguli oris is seen between the muscles 10 and 11 ; 10, zygomaticus minor ; 11,zygomaticus major ; 12, depressor labii inferioris ; 13, depressor anguli oris ; 14,levator labii inferioris ; 15, superficial portion of the masseter ; 16, part of its deepportion ; 17, attrahens aurem ; 18, buccinator ; 19, attollens aurem ; 20, temporalfascia covering the temporal muscle ; 21, retrahens aurem ; 22, ante
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