Thus the certainty of pregnancy in a woman may he divided into eight degrees: the disappearance of menstruation; nausea and vomiting in the first month; an increase in the size of the womb in the second month; a much greater increase of the womb in the third month; the extension of the womb over the pubic bones; the projection of the whole hypogastric region in the fifth month; and the spontaneous movement of the foetus, which kicks against the internal surface of the womb; lastly, at the beginning of the last month, the movements of tossing and displacement.'