“Produced by joy mixed with surprise, laughter makes the eyebrows rise towards the middle of the eye, and bend towards the sides of the nose; the eyes are almost shut and sometimes appear wet, or shed tears, which make no alteration in the face; the mouth half open, shows the teeth; the corners of the mouth drawn back, cause a wrinkle in the cheeks, which appear so swelled as to hide the eyes in some measure; the nostrils are open, and all the face is of a red colour.”