The Journal of experimental zoology . o call forth a reaction. An inspection of the record shows thatfor about three-quarters of an hour the amplitude of response toeach stimulus was practically the same. At the close of the periodthe amplitude decreased suddenly and the animal ceased to re-spond. These are precisely the effects exhibited by a muscleunder similar conditions. * For the apparatus by means of which these records were made, see figure 7in the first paper of this series (Hecht, 17). PHYSIOLOGY OF ASCIDIA ATRA LESUEUR 275 If these phenomena are to be explained in terms of the animal
The Journal of experimental zoology . o call forth a reaction. An inspection of the record shows thatfor about three-quarters of an hour the amplitude of response toeach stimulus was practically the same. At the close of the periodthe amplitude decreased suddenly and the animal ceased to re-spond. These are precisely the effects exhibited by a muscleunder similar conditions. * For the apparatus by means of which these records were made, see figure 7in the first paper of this series (Hecht, 17). PHYSIOLOGY OF ASCIDIA ATRA LESUEUR 275 If these phenomena are to be explained in terms of the animalsadaptation to the repeated stimulus, as maintained by Kinoshita(11) for Ciona and Styela (Parker, 17, p. 221), it follows that thecontinued rhythmic application of the stimulus should cease tobe effective after the animal has once stopped reacting to it,that is, once it has adapted itself. In Ascidia this is notthe case. In the curve in figure 2, for instance, the break afterthe point marked a means that the animal failed to respond.
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
