Page:The cat. Its natural history, varieties, and management.djvu/35

ourselves and most animals. Absolutely total darkness is evidently not advantageous to pussy’s vision, and the assertion that the cat can see better in the dark must not be regarded in an abstract, but in a comparative, sense. The pupil of the eye has the round shape, as in ourselves, only during darkness, when it is dilated so as to receive every ray of light available. By day, on the other hand, when there is more light than the eye requires, the pupil contracts to an ellipse, or, in the strongest light, to a mere line. This peculiarity is absent in the lion and tiger and a few others. A peculiarity in the cat and some other animals may be noticed in the highly-developed bristles, commonly called “whiskers,”