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Chap. VI

of the face of a man who coughs violently from being half choked.

With respect to the protection of the eye by the pressure of the eyelids, as serving to protect the eye, during violent expiration, Prof. Donders concludes from his various observations,*(16) that this action certainly limits or entirely removes the dilatation of the vessels. During violent expiratory efforts, we not unfrequently laid upon the eyelids, as if the better to support and defend the eyeball.

the conjunctiva becomes suddenly filled with blood, "and the eyelids everted."

73) (Not only are the muscles round the eyes strongly contracted, as Sir C. Bell states, and as I have often observed, during loud laughter, weeping, coughing and sneezing, but during several other analogous actions. A man contracts these muscles when he violently blows his nose. I asked one of my boys to shout as loudly as he possibly could, and as soon as he began, he firmly contracted his orbicular muscles; I observed this repeatedly, and on asking him why