GLOSSARY 335 Mutation: Change; alteration; the process of changing. Mute consonant: A surd or voiceless consonant. Mutism: Dumbness. MyeHn: The white covering of a nerve-fibre. Halve: Not reflecting; uncritical; artless; frank; simple; sincere. If ares: The cavity of the nose; the nostrils. Nasals Relating to the nose. If ascent: Coming into being; beginning to exist; undeveloped. Hatwral selection: Selection by the elimination of the unfit and the survival of the fit. necropsy; Post-mortem examination; examination of a body after death; autopsy. Negative: A plate from which photographs are printed. Negligible; Unimportant; that may be disregarded; not materially affecting results. Nephritis: Inflammation of the kidneys. Neural; Relating to the nervous system; relating to nerves. Neurasthenia: An exhausted condition with disturbances of the nervous system; nervous weakness; nervous prostration. Neuroses: Plural of neurosis. Neurosis s A nervous derangement; a functional nervous disease. Neurotic: Relating to neurosis; subject to neuroses; nervous. Nondtalsjott: Indifferent; unconcerned; cool. Noa»speculfttive: Not speculative; without theory or con- jecture. Norm: The normal type; standard. Notation: A system of signs or symbols ^ the symbols themselves. Nmcha: The nape or back part of the neck. Nuclei: Plural of nwkus* Nucleus: Kernel; centre; core. Nugatory: Insignificant; trifling; vain.