The Anatomy and Physiology of the Human Body Volume 2

The Anatomy and Physiology of the Human Body Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1827 edition. Excerpt: the brain or sensorium than in any other part of the body: we may rather say, that the impression made on the organ, nerves, and brain, is followed by sensation, and that the intelligence is the joint operation of the whole.t Lastly, the metaphysician calls our sensations the signs of external objects; because the object itself is not presented to the mind, nor is there an actual resemblance betwixt the object and the sensation of it, but merely a connexion established by nature, as certam features are natural signs of anger; or by art, as articulate sounds are the signs of our thoughts and purposes. We are now naturally led to the consideration of some points, the full comprehension of which require the knowledge both of anatomy and of the principles of optics. PARALLEL MOTION OF THK EYFS. The axis of the eye is a line drawn through the middle of the pupil and of the crystalline lens, and which consequently falls upon the middle of the retina The axes of the eyes, it is evident, are not always parallel; for when both eyes are directed to a near object, the axes of the eyes meet in that object; but when we direct the eyes to the objects in the heavens, they may be considered as perfectly parallel in their axis, though perhaps not then mathematically so. To an observer, the eyes seem always moving in parallel directions; but nature has given us the power of varying them so, that we can direct them to the same point, whether remote or near. This, however, is in some measure acquired by custom, and lost by disuse. A child has much difficulty in altering the distance of its eyes, which is the occasion of the vacancy of its stare;..nd we observe that a patient who has long lost one eye is incapable of directing the axis of the blind eye more

Product details

  • Paperback | 248 pages
  • 189 x 246 x 13mm | 449g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236506960
  • 9781236506962