She shook her head, pursing her lips together; a sign which people commonly employ to signify that they are not going, because it would bore them to go, when some one has asked, "Are you coming to watch the procession go by?", or "Will you be at the review?". But this shake of the head, which is thus commonly used to decline participation in an event that has yet to come, imparts for that reason an element of uncertainty to the denial of participation in an event that is past.