APHASIA. Impairment or lose of the ability to understand or use speech.
ASSOCIATIONISM. The psychological theory which regards the laws of association as the fundamental laws of mental action and development.
ATAVISTIC. Pertaining to reversion through the influence of heredity to remote ancestral characteristics.
ATAXIC. Pertaining to inability to coördinate voluntary movements; irregular.
CALAMO-PAPYRUS. Reed papyrus or pen-paper.
CATABOLISM. See METABOLISM.
CATHARSIS. Purgation or cleansing. Aristotle's esthetic theory that little renders immune for much.
CEREBRATION. Brain action, conscious or unconscious.
CHOREA. St. Vitus's dance; a nervous disease marked by irregular and involuntary movements of the limbs and face.
CHRESTOMATHY. A collection of extracts and choice pieces.