. Directions for laboratory work in physiology for the use of medical students. Physiology. GENESIS 01" TETANUS. 35 KXPERIMENT VII. Genesis of Fig. 7. Apparatus for studying sum- mation of contractions. A, block of wood wound with aluminum wire; B, primary coil; C, C, posts i and 2 ; D, dry cell; E, bare end of insulated wire turned back on itself. —The apparatus is to be arranged as in Experiment 3. except that the mercury key is to be omitted, and the current of the battery circuit is to be made and broken as folloAvs: Fasten the block of wood on which the aluminum
. Directions for laboratory work in physiology for the use of medical students. Physiology. GENESIS 01" TETANUS. 35 KXPERIMENT VII. Genesis of Fig. 7. Apparatus for studying sum- mation of contractions. A, block of wood wound with aluminum wire; B, primary coil; C, C, posts i and 2 ; D, dry cell; E, bare end of insulated wire turned back on itself. —The apparatus is to be arranged as in Experiment 3. except that the mercury key is to be omitted, and the current of the battery circuit is to be made and broken as folloAvs: Fasten the block of wood on which the aluminum wire is wound, to the edge of the table by a cabinet- maker's clamp. Connect the binding post on block with post I of coil; connect post 2 of coil with one pole of dry cell; and fasten an in- sulated wire to the other pole. NoAV bend the free end of this wire back on itself, so that the end shall be smooth and rounded. See that the wire is bright. If this wire be touched to any part of the aluminum coil the primaiy circuit will he made, and if the wire is drawn across the coils, a series of making and breaking shocks will be given. a. Sinnmation of Two Contractions. If two stimuli reach a muscle at a sufficiently short inter- val the second contraction process may begin before the first one is complete. What will be the result? In this, as in the preceding experiments, each student is to do the work independently. Experiment.—Blacken drum and arrange for quick speed ; make a muscle preparation and mount it in moist chamber, as in Experiment III; place drum so that lever. 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 Lombard, Warren P. (Warren Plimpton), 1855-1939. Ann Arbor, G. Wahr
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