Ids.—See p. 123.
Invertebrata.—Animals with a dorsal heart and without a backbone.
Karyokinesis.—The changes which are observed in the nucleus both immediately before and after cell division. See Chromatin threads.
Lamarckian factors. See Somatogenetic characters. Also Neo-Lamarckians.
Metaphyta.—Multicellular plants (q. v.).
Metazoa.—Multicellular animals (q. v.).
Micellae (Nägeli).—See Molecules, with which they are identical.
Microaomata.—The protoplasm of certain vegetable cells is in places characterized by the presence of minute corpuscles, which may be regarded as part of the protoplasm, and are certainly of a protoplasmic nature. These are termed Microsomata.
Molecules (Weismann).—See p. 122.
Multicellular organisms.—Organisms composed of many cells, as distinguished from the Unicellular organisms, where each individual is constituted of only one cell.