. Electro-physiology . FIG. '.a. positive electrode (infra). A much wider distribution of the lines of current, and hence a richer development of secondary kathodic points in the region of the anode, and conversely of secondary anodic points in the region of the kathode, occurs, however, invariably whenever the ureter is left in situ, or placed on a moderately good conductor (Fig. 92). Conditions being favour- able, excitation (contraction) will then occur on closure of the current at innumerable places in the proximity of the anode (not at the anode itself), and is either transmitted as an un
. Electro-physiology . FIG. '.a. positive electrode (infra). A much wider distribution of the lines of current, and hence a richer development of secondary kathodic points in the region of the anode, and conversely of secondary anodic points in the region of the kathode, occurs, however, invariably whenever the ureter is left in situ, or placed on a moderately good conductor (Fig. 92). Conditions being favour- able, excitation (contraction) will then occur on closure of the current at innumerable places in the proximity of the anode (not at the anode itself), and is either transmitted as an undulation (ureter), or remains localised as a persistent contraction. Con- versely, further diffusion of the closure—excitation discharged at the kathode proper is hindered by the vicinity of secondary anodic points. It can hardly be necessary to point out that these considera- tions are legitimate and valid in all the cases previously quoted, where, as in the muscles of Holothuria and Echinidse, and also the muscular integument of worms, and the intestine of verte-
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