. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . ed ina physical model. Since the model may be regarded as an arti-ficial nerve, just as an arrangement of tubes and syringes gives aworking model of the circulatory system, it is hoped in this way tothrow some light on the physical structure of the nerve. Such aninstrument of investigation is called a core model (see Fig. 60), Untersuchungen iiber Electrotonus, Berlin, 1859. 140 THE NERVES AS CONDUCTORS or a core conductor. It consists of a central co
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . ed ina physical model. Since the model may be regarded as an arti-ficial nerve, just as an arrangement of tubes and syringes gives aworking model of the circulatory system, it is hoped in this way tothrow some light on the physical structure of the nerve. Such aninstrument of investigation is called a core model (see Fig. 60), Untersuchungen iiber Electrotonus, Berlin, 1859. 140 THE NERVES AS CONDUCTORS or a core conductor. It consists of a central core of good elec-trical conductivity, surrounded by a sheath of lower may be constructed of various materials; that of Hermann con-sisted of a platinum wire (the core) stretched the length of a glasstube filled with a solution of some salt. The glass tube was em-ployed simply for the piu-pose of holding the sheath of solution inplace, and was provided with small side tubes through which theexciting current could be led in, and the electrotonic currents (if any)led out to a galvanometer. Hermann found, in fact, that currents. Fia. 60.—Hermanns Core Model. AB, glass tube; ab, platinum wire;c, d, e, f, g. A, side tubes. equivalent to those of electrotonus were produced in the extrapolarregions of the core model as in the nerve; he, accordingly, con-cluded that the physical structure of a nerve resembles that of thecore conductor, and that the electrotonic currents were purelyphysical phenomena. The same line of investigation has been carried further by Bo-ruttau,^ who has found that, not only the electrotonic currents, butall the electrical phenomena occurring in the nerve from the actionof a current on it can be imitated in the core model. In this way,even the ciu-rent of action can be imitated; and as this is closelyassociated, in a genuine nerve, with the transmission of the nerveimpulse, Boruttau advances the view that the core conductor, likethe nerve, can re
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