Essays, physiological and philosophical, on the distortion of the spine, the motive power of animals, the fallacy of the senses, and the properties of matter / By C.H. Wilkinson.

  • Wilkinson, C. H. (Charles Henry), 1763 or 1764-1850.
Date:
1798
Catalogue details

Licence: Public Domain Mark

Credit: Essays, physiological and philosophical, on the distortion of the spine, the motive power of animals, the fallacy of the senses, and the properties of matter / By C.H. Wilkinson. Source: Wellcome Collection.

    75/214 (page 57)
    - Suppofing he is in that ftate as only to be not more than 4 feet in a fecond; proceéding as above, the power of rifing will be 120lb. being double its own weight. . | It has been much difputed whether, in the rapidity of motion, birds are capable of diftinguifh- ing objeéts. In the Philofophical Tranfattions for the year 1795 thereis a paperon the ftruéture marks being precifely the fame with thofe of Dr. Derham, in his Phyfico Theology, certainly can- not merit any attention on account of novelty. Dr. Derham remarked a loricated ftate of that part of the {clerotica which immediately furrounds the cornea, a€ting like pulleys, over which the tendinous fibres were fpread, and which termi- nated in forming the four recti mufcles. The Doftor fuppofed fuch a confirmation neceflary for the quick changes of vifion in birds, to enable them to fee their food at their bill’s ends, or to diftinguifh the utmoft diftance -their high flights enable them to view, that the focal pow- ers of the eye may be accommodated to the different refraGtions they muft experience in the different aérial media in which they are immerged: to this fuppofition there are many ] eye