152 EXPRESSION OF SUFFERING: CHAP. VI. eyes is chiefly due to the copious effusion of tears. The various muscles of the face which have heen strongly contracted, still twitch a little, and the upper lip is still slightly drawn up or everted,7 with the corners of the mouth still a little drawn downwards. I have myself felt, and have observed in other grown-up persons, that Avhen tears are restrained with difficulty, as in reading a pathetic story, it is almost impossible to prevent the various muscles, which with young children are brought into strong action during their screaming-fits, from slightly twitching or trembling. Infants whilst young do not shed tears or weep, as is well known to nurses and medical men. This circum- stance is not exclusively due to the lacrymal glands being as yet incapable of secreting tears. I first noticed this fact from having accidentally brushed with the cufl: of my coat the open eye of one of my infants, when seventy-seven days old, causing this eye to water freely; and though the child screamed violently, the other eye remained dry, or was only slightly suffused with tears. A similar slight effusion occurred ten days previously in both eyes during a screaming-fit. The tears did not run over the eyelids and roll down the cheeks of this child, whilst screaming badly, when 122 days old. This first happened 17 days later, at the age of 139 days. A few other children have been observed for me, and the period of free weeping appears to be very variable. In one case, the eyes became slightly suffused at the age of only 20 days; in another, at 62 days. With two other children, the tears did not run down the face at the ages of 84 and 110 days; but in a third child they did run down at the age of 104 days. In one instance, as I was positively assured, tears ran down at the unusually early 7 Dr. Duchenne makes this remark, ibid. p. 39.