(23)

Ch. VI.

the eye actually suffered injury from the want of support during violent expiration; but there is some. It is "a fact that forcible expiratory efforts, in violent coughing or vomiting, & especially in sneezing, sometimes give rise to ruptures of the little (external) vessels", of the eye.

With respect to the internal vessels, Dr. Greening has lately recorded a case of exophthalmos, in consequence of whooping-cough, which in his opinion depended on the rupture of the deeper vessels; another analogous case has also been recorded.* (17) But a sense of discomfort, without any natural injury to the eye, would probably suffice to lead to the associated habit of protecting the eyeball by the contraction of the surrounding

(a) from Sir C. Bells observations & more especially from Prof. Donders more careful investigations that the firm closure of the eyelids during the screaming or crying of children

[Expression, p. 162.]