On the Sclerotic Ring of the Eyes of Birds And Reptiles
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As regards the structure of the rings, the bones generally overlap each other, there being a depression on the under side of one bone, and a precisely corresponding one on the upper side of its neighbour, so that when overlapping each other, they present nearly an even surface, both exteriorly and interiorly ; having one bone with both depressions on its inner surface, and forming an exterior key to the arch, and one having both depressions on its outer surface, and forming an internal key ; in... some instances there are two external keys ; and in several instances, instead of one bone overlapping the other, they inter- lock into each other in a curious and beautiful manner.
I take it for granted that the principal function of these sclerotic rings is, as stated by Cuvier, to preserve that peculiar form of the eye which is adapted to the nature and wants of the animals. But in nature's laboratory there is no prodigality or waste of power ; and these rings having, in the first place, fulfilled the duties for which they were primarily created, still subserve the wants of the animal in other ways, and under cir- cumstances and in situations to which those classes of animals which have not such rings are not exposed.
What to read after On the Sclerotic Ring of the Eyes of Birds And Reptiles?
You can find similar books in the "Read Also" column, or choose other free books by Thomas T Ellis to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As regards the structure of the rings, the bones generally overlap each other, there being a depression on the under side of one bone, and a precisely corresponding one on the upper side of its neighbour, so that when overlapping each other, they present nearly an even surface, both exteriorly and interiorly ; having one bone with both depressions on its inner surface, and forming an exterior key to the arch, and one having both depressions on its outer surface, and forming an internal key ; in... some instances there are two external keys ; and in several instances, instead of one bone overlapping the other, they inter- lock into each other in a curious and beautiful manner.
I take it for granted that the principal function of these sclerotic rings is, as stated by Cuvier, to preserve that peculiar form of the eye which is adapted to the nature and wants of the animals. But in nature's laboratory there is no prodigality or waste of power ; and these rings having, in the first place, fulfilled the duties for which they were primarily created, still subserve the wants of the animal in other ways, and under cir- cumstances and in situations to which those classes of animals which have not such rings are not exposed.
What to read after On the Sclerotic Ring of the Eyes of Birds And Reptiles?
You can find similar books in the "Read Also" column, or choose other free books by Thomas T Ellis to read onlineMoreLess
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