Zoologists know that a nonpregnant bitch may secrete milk in abundance.

Delafond and de Sinnety have cited instances.
Lactation in the aged has been frequently noticed.

Amatus Lusitanus and Schenck have observed lactation in old women; in recent years Dunglison has collected some instances.

Semple relates the history of an elderly woman who took charge of an infant the mother of which had died of puerperal infection.

As a means of soothing the child she allowed it to take the nipple, and, strange to say, in thirty-six hours milk appeared in her breasts, and soon she had a flow as copious as she had ever had in her early married life.