great cries, to the horror and surprise of all those present.

In order that the living may be distinguished from the dead, old writers
prescribe three experiments. The first is, to lay a feather on the
mouth, and by its movements you may judge whether the patient be alive
or dead; the second is, to place a glass of water on the breast, and if
it moves, it betokens life; the third is, to hold a bright, clean,
looking-glass to the mouth and nose, and if the glass be dimmed with a
little moisture on it, it betokens life. These three experiments are
good, but you must not depend upon them too much, for though the feather
and the glass do not move, and the looking-glass continues bright and
clear, yet it is not a necessary consequence that she is dead. For the
movement of the lungs, by which breathing is produced, may be checked,
so that she cannot breathe, and yet internal heat may remain, which is
not evident by the motion of the breast or lungs, but lies hidden in the
heart and arteries.

Examples of this we find in flies and swallows, who seem dead to all
outward appearances, breathless and inanimate, and yet they live by that
heat which is stored up in the heart and inward arteries. At the
approach of summer, however, the internal heat, being restored to the
outer parts, they are then brought to life again, out of their sleeping
trance.

Those women, therefore, who apparently die suddenly, and from no visible
cause, should not be buried until the end of three days, lest the living
be buried instead of the dead.