Rudiments of animal physiology : for use in schools, and for private instruction / by G. Hamilton.

  • Hamilton, George, 1808-1885
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Rudiments of animal physiology : for use in schools, and for private instruction / by G. Hamilton. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    ^2 THE NERVOUS SYSTEM—THE SENSES. work on the intellectual powers, the works of phrenologists, those on somnambulism and animal magnetism, &c., contain some veiy interesting facts on this subject. [To illustrate this section, the brain of a sheep should be exhibited, which can easHy be done by sawing through the skull from behind the eyes down to the opening for the spinal marrow (taking cax'e not -to saw too deep), and then wrenching it oft* with a screw-driver 'Or other strong lever. The membranes covering the brain will be .observed. These should be slit open, and the brain lifted up .anteriorly, when the different nerves, commencing with the olfac- tory, will come into view, and must be cut through, and the brain taken out and placed in spirits for a few hours to harden it. The •nerves, as seen in Fig. 33, the ventricles in the interior of the brain, :and the other parts described here, and in anatomical works, may then easily be seen. A cod's or haddock's brain and spinal marrow jnay easily be shown, by cutting with a strong pair of scissors the spinal rings and skull. Besides these, if wished, the progressive developement of the brain in different species may, with a little care and patience, be shown in the fowl, the hare or rabbit, the adder or frog, &c. A few easts, showing the size and appearance of the human brain, that of the orang-outang, of idiots, &c., and casts of the heads of the Carib, Negro, European, &c., form excellent illustrations of this section, and can easily be got from O'Neil in Edinburgh, and other stucco dealers. Appropriate figures for illustrating this section will be found in Fletcher's Rudiments of Physiology, Part 1, pages 47 and 48; in Lizars's coloured plates, pages 64, 67, 68 • in Roget's Bridgewater Treatise, vol. ii. pages 547, 550, 552,] SECTION IX. THE SENSES. 168. The senses are the means by vrhich the mind becomes acquainted with external objects. Without the materials which they furnish, its exercise would be impossible. When the mind has once experienced various sensations, the memory can recal them when they are gone; the judgment can compare them, and can perceive their relations, and the imagination can combine them into endless varieties; but still, with all this, we are incapable of figuring to ourselves any image, the elements at least of which have not first been made known to us through sensation.
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