An essay upon single vision with two eyes : together with experiments and observations on several other subjects in optics / by William Charles Wells, M.D.

  • Wells, William Charles, 1757-1817.
Date:
1792
Catalogue details

Licence: Public Domain Mark

Credit: An essay upon single vision with two eyes : together with experiments and observations on several other subjects in optics / by William Charles Wells, M.D. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    lar in regard to their life. In animals of the fame fpecies, they believe with certainty, that the organs they fee in one have the fame properties, as the correfponding or- gans of another; and, if it be poffible, they attribute with greater certainty the fame properties to two organs of the like kind, which are found in the fame indivi- dual. Such is the influence of the rule, that refemblance of property is implied by refemblance of liructure. Now it is an imiverfal fact, that if an animal be divided Irito a right and left half, the correfponding . parts of thofe organs, which exift in pairs, are found at equal diftances from the plane of partition. Thus, for inftance, in refpect to the eyes, the two optic nerves penetrate their outward coat at the fame diftance from this plane. Their mufcles, blood-veffels, and every other of their component parts and appendages,are arranged in the like manner; thofe neareft to the dividing plane, or the innermoft, in the one, being fimilar in ftruclure to the innermoft. in the other, the outermoft to the outermoft, and the inter- E mediate