American journal of physiology . The conception of a more or less sharply defined homolateral andlocal action of the vagi is more strongly emphasized if we study theaction of each vagus upon its corresponding auricle. Here, again,the reference to tracings makes conditions most clear. In Fig. lo trac-ings are taken with the levers of like dimensions attached to the auricles. The left vagus was stimu-lated at A with the secondarv coil at4 cm.; even this strong current pro-duced no change in the rate, but onlytonus changes in the height of con-traction, the effect upon the left au-ricle being muc
American journal of physiology . The conception of a more or less sharply defined homolateral andlocal action of the vagi is more strongly emphasized if we study theaction of each vagus upon its corresponding auricle. Here, again,the reference to tracings makes conditions most clear. In Fig. lo trac-ings are taken with the levers of like dimensions attached to the auricles. The left vagus was stimu-lated at A with the secondarv coil at4 cm.; even this strong current pro-duced no change in the rate, but onlytonus changes in the height of con-traction, the effect upon the left au-ricle being much more pronouncedthan upon the right. When the rightvagus was stimulated at B with amuch weaker current (secondary at9 cm.), a change in rate was effected asa result of action on the veins of theright side; at the same time the de-. PlGURE 10. — One half the originalsize. Tracings of the auricularcontractions showing the homo-lateral eilects of the vagi. Upper,from the left auricle; lower, fromthe right auricle. A = stimulationof the left vagus; B= stimulationof the right vagus. crease in height of contraction was much more pronounced upon the rightauricle than upon the left. Similareffects were noted in all other tracings made by the author; theeffects were found to be more pronounced and to last longer on theauricle homolateral to the vagus stimulated, even when, for com-parison; the strength of stimuli applied to the two nerves was experiment was devised to show the effects of stimulationof the vagi with single induction shocks thrown in at difterent in-tervals. The graphic results are not shown, but an analysis of thetracings is given in Table II. It follows from this analysis that the homolateral effect of eachvagus is decidedly greater than the contralateral. This is best shownunder the effe
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