. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ^ may be regardedas a resonator excited by induction instead of by direct connection withthe oscillator. The inductance of the primary circuit should thereforebe adjustable in the manner described above (p. 102) in treating ofthe resonator. SECTION II ELECTROPHYSIOLOGY CHAPTER V ANIMAL ELECTRICITY The fact that animal tissues can produce an electric current wasfirst demonstrated by Galvani in 1793. By laying the exposed musclesof the leg of a frog upon a glass plate and touching them with the end o
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . ^ may be regardedas a resonator excited by induction instead of by direct connection withthe oscillator. The inductance of the primary circuit should thereforebe adjustable in the manner described above (p. 102) in treating ofthe resonator. SECTION II ELECTROPHYSIOLOGY CHAPTER V ANIMAL ELECTRICITY The fact that animal tissues can produce an electric current wasfirst demonstrated by Galvani in 1793. By laying the exposed musclesof the leg of a frog upon a glass plate and touching them with the end of Fig. 82. Scheme to illustrate the action current of a simple muscular contraction. A, B, C, a, piece of muscle,E, E, electrodes connected by a wire to a galvanometer, G. Stimulation of the muscle at A causes awave of contraction to begin at this point and this electrode becomes negative to E, which is positive,and the needle G shows a corresponding variation. When the wave of contraction reaches the middlepoint B, the potential of A and B now being the same, no current passes and the needle returns to thezero point. The wave now passes toward C, which in turn becomes negative to A, and the needle isdeflected in the opposite direction. (James.) the sciatic nerve which had previously been dissected out and cut offclose to the spinal cord, he caused contraction of the muscles. Voltahowever, denied that the electricity was produced by the tissues, andclaimed that it was due to the contact of dissimilar fluids and tissues. 106 ANIMAL ELECTRICITY This view was held until 1841, when Du Bois Reymond b
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