. General physiology; an outline of the science of life. 264 GENERAL PHYSIOLOGY :of vital force, upon a clear, exact foundation by creating for the first time sure and comprehensive methods of research. In the beginning, for evident reasons, only the muscles and nerves of the frog served as objects of experiment; but soon du Bois-Reymond brought into the range of his studies the interesting phenomena of the electrical fishes. And numerous inquirers, such as H. Munk, Hermann, Engelmann, Bernstein, and most recently Biedermann ('95), investigated the electrical phenomena of plants and various an
. General physiology; an outline of the science of life. 264 GENERAL PHYSIOLOGY :of vital force, upon a clear, exact foundation by creating for the first time sure and comprehensive methods of research. In the beginning, for evident reasons, only the muscles and nerves of the frog served as objects of experiment; but soon du Bois-Reymond brought into the range of his studies the interesting phenomena of the electrical fishes. And numerous inquirers, such as H. Munk, Hermann, Engelmann, Bernstein, and most recently Biedermann ('95), investigated the electrical phenomena of plants and various animal tissues. We are indebted to the researches of Hermann for the key to an understanding of the electrical. Fig. 118.—A, Simple arrangement for the production of a galvanic current. Za, Zinc ; Ci', copper ; the two joined below by a moist thread. The arrows indicate the direction of the current. B, Simplest form of a galvanic element. Two metal strips (copper and zinc) dip into a liquid and are joined together by a metal at their free ends. The current goes in the direction of the aiTow. phenomena of living substance. But it is due indisputably to the fundamental labours of du Bois-Reymond that the science of animal electricity has become one of the best-known branches of physiology. The simplest method of obtaining a galvanic current, as is well known, is that of soldering together at one end two strips of different metals, , copper and zinc, and bringing their free ends into contact with a moist conductor, , a moist thread (Fig. 118, A). At the moment when the free ends of the metals are joined by the conductor, an electric current begins to flow in the closed circuit, passing from the zinc through the conductor to the copper and from the copper through the. 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 orig
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