The Journal of Anatomy and Physiology, Volume 7

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Macmillan, 1873
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Page 300 - SCHOOL. Second edition, revised and enlarged, with the cooperation of S. ARLOING, late Principal of Anatomy at the Lyons Veterinary School ; Professor at the Toulouse Veterinary School. Translated and edited by GEORGE FLEMING, FRGS, MAI, Veterinary Surgeon, Royal Engineers. 1 vol., 8vo.
Page 254 - ... paper on which to rest the preparation. To protect the preparation from the irritant action of the sulphate of zinc, a thin film or guard of sculptor's clay, moistened with a '75 per cent, solution of common salt, and worked out to a point, is placed on each cushion.
Page 255 - When a diffused light is allowed to impinge on the eye of the frog, after it has arrived at a tolerably stable condition, the natural electromotive power is in the first place increased, then diminished ; during the continuance of light it is still slowly diminished to a point where it remains constant ; and on the removal of light there is a sodden increase of the electro-motive power nearly up to its original position.
Page 258 - ... 6. The sclerotic and nerve without the retina, in the same manner, gave a large natural electro-motive force, also not sensitive. 7. The distribution of the electro-motive force between the different portions of the eye and cross section of the nerve may be stated as follows : The most positive structure is the cornea, then the sclerotic, then the longitudinal surface of the nerve ; the cornea is also positive to the posterior surface of the crystalline lens, and the retina itself seems to be...
Page 259 - It was apparent to us that these experiments would ultimately bear upon the theory of sense-perception as connected with vision. It is now generally admitted that no image, as such, of an external object, is conveyed to the sensorium, but that in reality the brain receives certain impressions of alterations taking place in the receiving organ. The natural query then arises — are the physical effects we have described and measured really comparable in any way with our sensational differences in...
Page 141 - The wood immediately below the iron head is smeared with the poison. When the arrow is shot into an animal, the reed either falls to the ground at once, or is very soon brushed off by the bushes ; but the iron barb and poisoned upper part of the wood remain in the wound. If made in one piece, the arrow would often be torn out, head and all, by the long shaft catching in the underwood, or striking against trees.
Page 140 - Falls of the Zambesi. The stem is several inches in diameter, and rough outside. The plant climbs up the highest trees, and hangs from one to the other like a bush-vine. The flowers are of a...
Page 259 - If, therefore, the observed differences in electro-motive power, registered under conditions of varying luminous intensity, agree with this law of Fechner, regulating our sensational impressions, then there can be little doubt these variations are the cause of, and are comparable to, our perception of sensational differences. Now, we have stated above, that with a quantity of light one hundred times in excess of another quantity, the electro-motive force only becomes three times greater. According...
Page 295 - When the same muscle (or group of muscles) is kept in constant action until fatigue sets in, the total work done, multiplied by the rate of work, is constant.
Page 256 - It is clear that to register minute galvanometrical alterations, the only plan that could bo employed would be to photograph on a sensitive surface, covering a cylinder rapidly revolving on a horizontal axis, the alteration of position of the spot of light reflected from the mirror, just as continuous magnetic observations are registered. As the apparatus required to execute these observations...

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