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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin: We know that during violent expiratory efforts the pressure
of the arterial blood within the vessels of the eye is increased,
and that the return of the venous blood is impeded.
It seems, therefore, not improbable that the distension
of the ocular vessels, thus induced, might act by reflection
on the lacrymal glands--the effects due to the spasmodic pressure
of the eyelids on the surface of the eye being thus increased.
In considering how far this view is probable, we should bear
in mind that the eyes of infants have been acted on in this
double manner during numberless generations, whenever they
have screamed; and on the principle of nerve-force readily
Expression of Emotion in Man and Animals |
