able desire for
drink. _Morphinomania_, a craving for morphine or its preparations.
_Erotomania_, or amorous madness. When occurring in women this is also
called _Nymphomania_, and in men _Satyriasis_. It consists in an
uncontrollable desire for sexual intercourse. _Pyromania_, an insane
impulse to set fire to everything. _Homicidal mania_, a propensity to
murder. _Suicidal mania_, a propensity to self-destruction. Some
consider suicide as always a manifestation of insanity.

=Insanity of Pregnancy.=--This may show itself after the third month of
pregnancy in the form of melancholia. It is not recovered from until
after delivery.

=Puerperal Mania.=--This form of mania attacks women soon after
childbirth. There is in many cases a strong homicidal tendency against
the child.

=Insanity of Lactation= comes on four to eight months after parturition,
either as mania or melancholia. The mother may repeatedly attempt
suicide.

=Mania with Lucid Intervals.=--In many cases mania is intermittent or
recurrent in its nature, the patient in the interval being in his right
mind. The question of the presence or absence of a lucid interval
frequently occurs where attempts are made to set aside wills made by
persons having property. In these cases the law, from the reasonableness
of the provisions of the will, may assume the existence of the lucid
interval. A will made during a lucid interval is valid. When an attempt
is made to set aside the provisions of a will on the ground of insanity
in a person not previously judged insane, the plaintiff must show that
the testator was mad; when the provisions of the will of a lunatic are
attempted to be upheld, the plaintiff must show that the will was made
during a lucid interval.

A testator is capable of making a valid will when he has (1) a knowledge
of his property and of his kindred; (2) memory sufficient to recognize
his proper relations to those about him; (3) freedom from delusions
affecting his property and his friends; and (4) sufficient physical and
mental power to resist undue influence. The fact of a man being subject
to delusions may not affect his testamentary capacity. He may believe
himself to be a tea-kettle, and yet be sufficiently sound mentally to
make a valid will.

=Undue Influence.=--Persons of weak mind or those suffering from senile
dementia are often said to have been unduly influenced in making their
wills, and subsequently their dispositions are disputed in