La théologie naturelle : ou, titres de l'existence et les attributs de la divinité : recueillies à partir de l'apparence de la nature . lation bas-quartiers. Mais la base sur laquelle ils reposent à thisend étant fixées, la conséquence de l'obliquité,ou l'inclinaison vers le bas, est, que lorsqu'theycome à déplacer, quels que soient les côtes vers le haut,tire nécessairement, en même temps, tire-les;et que, alors que les côtes sont portées à un rightangle avec la colonne vertébrale en arrière, le sternum, ou la poitrine pour laquelle ils sont fixés à l'avant, isthrust avant. La simple action, par conséquent, de l'élever les muscles ne e

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Natural theology : or, evidences of the existence and attributes of the Deity : collected from the appearances of nature . lation down-wards. But the basis upon which they rest at thisend being fixed, the consequence of the obliquity, or the inclination downwards, is, that when theycome to move, whatever pulls the ribs upwards, necessarily, at the same time, draws them out;and that, whilst the ribs are brought to a rightangle with the spine behind, the sternum, or partof the chest to which they are attached in front, isthrust forward. The simple action, therefore, ofthe elevating muscles does the business; whereas, if the ribs had been articulated with the bodies ofthe vertebrae at right angles, the cavity of thethorax could never have been farther enlarged bya change of their position. If each rib had beena rigid bone, articulated at both ends to fixedbases, the whole chest had been immoveable, t * For the mode of articulation of the ribs with the vertebrjB, see Tab. IX. Fig. 1 and 2. -j- Tab. X. Fig. 1. The spine, ribs, and sternum, constitute theframe Mork of the chest or thorax. Referring, however, to the. r„hli../, e, ll; j.n IN THE HUMAN FRAME. 107 Keill has observed, that the breast-bone, in aneasy inspiration, is thrust out one-tenth of an inch:and he calculates that this, added to what is gainedto the space within the chest by the flattening ordescent of the diaphragm, leaves room for forty-two cubic inches of air to enter at every drawing-in of the breath. When there is a necessity fora deeper and more laborious inspiration, the en-largement of the capacity of the chest may beso increased by effort, as that the lungs maybe distended with seventy or a hundred such cubicinches.* The thorax, says Schelhammer, forms akind of bellows, such as never have been, norprobably will be, made by any artificer, t V. The patella, X or knee-pan, is a curious little plate, or to nature, we observe that the ribs are not continuedthroughout from the spine to the sternum, but int

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