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| | Physiological Correspondences: the Pleura |
 | | Again, the heart to contract freely and uniformly, must be maintained in the same relative position during all the changes and motions of the body; and still it must not be attached and bound except at the base, where it gives forth the arteries and veins. |
 | | And, further, the lungs must be maintained in their proper position, and not allowed in state of collapse to fall upon the heart or to suffer displacement; and in their place they must be protected from the ribs, and provided with the means of working without frictions, freely and smoothly. |
 | | From the base of the lungs the pleura is reflected upon itself, and forms two membranous bas loosely enclosing again the already encased lungs. |
| www.theisticscience.org /books/worcester/pleura.html (600 words) |
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