. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 23 4 FIGURE 2. Mechanogram of the twitch closer contraction of Canihurns clarkii after treatment with procaine. A.—At 1, J^ ml. per cent solution of procaine was injected into the claw. At 2, 3, and \ the claw was washed with van Harreveld solution. B.—The nerve was treated with a 1 per cent procaine solution in a nar- cotic chamber at 1 and 3. The chamber was emptied and refilled with van Harreveld solution at 2 and 4. Single induction break shocks were given every 30 seconds in A; every minute in B. Note that in A the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 23 4 FIGURE 2. Mechanogram of the twitch closer contraction of Canihurns clarkii after treatment with procaine. A.—At 1, J^ ml. per cent solution of procaine was injected into the claw. At 2, 3, and \ the claw was washed with van Harreveld solution. B.—The nerve was treated with a 1 per cent procaine solution in a nar- cotic chamber at 1 and 3. The chamber was emptied and refilled with van Harreveld solution at 2 and 4. Single induction break shocks were given every 30 seconds in A; every minute in B. Note that in A the contraction disappears and reappears gradually, in B, all at once. libers exhibit a lengthening of the refractory period (Wedensky, 1904). Because of the dependence of the slow contractions upon facilitation (repetitive stimulation), lengthening of the refractory period would make it impossible for the impulses to follow each other at a high enough frequency to produce a contraction. This seems the more likely explanation for the failure of the slow system before the fast system, especially since in this state faradic stimulation of the fast shows a smaller contraction than the normal one-. Drugs pro- ducing this anaesthetizing effect when injected into the claw are nupercaine (), procaine (), diothane (), amphetamine (1%), and atropine (K'r). The concentrations indicated produced failure in the slow system within five 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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