Cassell's Book of Birds, Reading 1
Boring Books for Bedtime Readings to Help You Sleep
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Defining the Function of the Dying Membrane in the Eye
The membrane itself is capable of being drawn out like a thin sheet of India rubber, and of returning to its former position when the force acting upon it is removed. Such being its nature, in order to adapt it for its office, it is connected by a tendon with a muscle situated at the back part of the eye. The extent of contraction necessary to draw the membrane over the whole front of the visual organ would require a much longer muscle than could have been placed in such a situation. In order to meet this difficulty, the tendon which draws forth the dictating membrane is made to pass the reloop in another muscle as represented in the next woodcut.
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