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Radiation, discrimination from temperature effect, 615 ,, effect of electric, on Mimosa, 619 ,, identity of, in mature and growing organ, 435 ,, relation of, to stimulus, 95, 96, 97 ,, similarities of, between motile and growing organs, 437 See Chemotaclic-, Chemotropic-, Death-, Differential-, Galvanotactic-, Galvanotropic-, Geotropic-, Growth-, Heliotropic-, Inorganic-, Mechanical-, Phototropic …

… 2 According to Kappers, the direction of outgrowth of nerve-tracts in the central nervous system is the expression of a directive electrical influence (analogous to galvanotropism) which he caUs "neurobiotaxis." Cf. Kappers, "On Structural Laws in the Nervous System," Brain, XLIV (192 1), 125, and earlier references …

… This summarized statement is the usual form of the ''law of polar stimulation." It is important to note, however, that a polar action is seen in many other physiological processes occurring under the influence of the current; e.g., electrotonus, polar disintegration of cells, galvanotropic growth, and galvanotaxis …

… Similarly, cell mobility, including galvanotaxic movement of cells and galvanotropism in response to endogenous, global electric fields, is another key component of bioelectric pattern regulation. BETSE currently considers a fixed lattice of cells, which cannot move with respect to the environment. Cell and cluster shape changes in response …

… I shall now be able to show further that the galvanotropic effects observed are all deducible from these. Incidentally, too, owing to certain special advantages afforded by growth-response, we shall be able to discover additional effects which could not have been detected by the mechanical response of …