. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 208 FRANK P. KNOWLTON to the muscle tendon or to the movable jaw of the claw, the tendon of the adductor being cut. Single Brief Electrical Currents Proceeding as above, single shocks were applied at regular intervals and intensity gradually increased from a subliminal value. Intervals were of sufficient length so that cumulative summation of effects of previous stimuli did not occur. Under such conditions, the quick con- traction (twitch) always appeared first. As stimulus intensity was increased, the slow type of contracti
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 208 FRANK P. KNOWLTON to the muscle tendon or to the movable jaw of the claw, the tendon of the adductor being cut. Single Brief Electrical Currents Proceeding as above, single shocks were applied at regular intervals and intensity gradually increased from a subliminal value. Intervals were of sufficient length so that cumulative summation of effects of previous stimuli did not occur. Under such conditions, the quick con- traction (twitch) always appeared first. As stimulus intensity was increased, the slow type of contraction appeared as a shoulder broadening the curve (Fig. \A). If the time interval between stimuli is shortened,. FIG. 1. A. Spider crab adductor stimulated directly by single condenser dis- charges of increasing Time in seconds. B. Same preparation as A. Weaker stimuli applied during relaxation of slow contraction. C. Spider crab adductor stimulated directly by single condenser discharges. Quick contractions are superimposed on a slowly rising tonus. Time in seconds. D. Spider crab adductor stimulated through its nerve by single condenser dis- charges. Fourth and fifth contractions show a slow contraction developing after the quick contraction is over. Time in seconds. summation effects appear and the quick contractions are added to a slowly rising tonus wave (Fig. 1C). When the muscle was stimulated directly by a single condenser discharge or an induction shock, the had. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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