The laws and mechanics of circulation, with the principle involved in animal movement . dy, produced by the occasional deep andenergetic inspirations which the animals take, especially afterrousing from slumber and during digestion ; the whole bodyrocking forward upon the limbs under the energetic action inthe diaphragm, exerted through the ribs and spinal is deeply interesting. One other circumstance of deep im-port remains for mention in this connection, though we shallnot do more than make a passing reference, as the matterpertains more particularly to another work.* Notably, by *
The laws and mechanics of circulation, with the principle involved in animal movement . dy, produced by the occasional deep andenergetic inspirations which the animals take, especially afterrousing from slumber and during digestion ; the whole bodyrocking forward upon the limbs under the energetic action inthe diaphragm, exerted through the ribs and spinal is deeply interesting. One other circumstance of deep im-port remains for mention in this connection, though we shallnot do more than make a passing reference, as the matterpertains more particularly to another work.* Notably, by * See Gravitation and Development. EESPIKATORY EOCKING IN THE BODT. 91 the action in the diaphragm the viscera are thrown againstthe anterior walls of the abdomen during inspiration, movingdownward and backward in place of directly backward ; theobject being to avoid impact in the pelvic viscera, which wouldtend to force out the contents and produce strain in the organs,hence must be avoided. And by attaching the diaphragmto the lumbar vertebrae and the ribs in the manner as obtains,. Fig. 27.—Section of the chest-walls, showing position of the diaphragm in the excava-tion and the relations it sustains to the lungs and ribs, the muscular fibres corre-sponding with the long axis in the ribs (A, F, F). A, diaphragm ; B, lungs ; C,heart; D, pericardium, reflected ; E, sternum ; F, ends of the ribs. with the muscles acting in the long axis in the ribs, thisaction in the viscera is readily effected, so that impact in thepelvic viscera is entirely obviated, which, for reasons alreadygiven, must apply for every stage in development The de-pression which occurs in the epigastric region during inspira- 92 ACTION IN THE LUNGS. tion is due to the bending in of the costal and ensif orm cartilagesproduced by the traction in the diaphragm ; but as life ad-vances and they become more and more ossified, it is less andless conspicuous by reason of the rigidity this produces in thestructures. T
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