NECESSITY

Controlling rorce; irresistible compulsion; a power or impulse so great that it admits no choice of conduct. When it is said that an act is done "under nece ity," it may be, in law, either of thr€e kinds of nece ity: (1) The nece ity of preserving one's own life, which will excuse a homicide; (2) the nece ity of obedience, as to the laws, or the obedience of one not s·ul Jurla to his superior; (3) the nece ity caus- [s. 815]