. Calcutta Journal of Natural History. Electricity and Galvanism, 239 bubbles of hydrogen. Once more let me unite the wires, the electri- city from the decomposing salt again traverses the solution; again chemical forces are paralysed, and we shall soon see the spongy amalgam of ammonium and mercury reappear. Fig. A r° Ml 1 * Fig. 2. Fig. 1, Battery. A, Vessel containing solution of common salt. B, Glass cylinder, closed with a plug of plaster of Paris, and containing a solution of sulphate of copper. C, Copper plate. Z, Zinc plate. Fig. 2, Decomposing cell. A, Vessel containing solution o
. Calcutta Journal of Natural History. Electricity and Galvanism, 239 bubbles of hydrogen. Once more let me unite the wires, the electri- city from the decomposing salt again traverses the solution; again chemical forces are paralysed, and we shall soon see the spongy amalgam of ammonium and mercury reappear. Fig. A r° Ml 1 * Fig. 2. Fig. 1, Battery. A, Vessel containing solution of common salt. B, Glass cylinder, closed with a plug of plaster of Paris, and containing a solution of sulphate of copper. C, Copper plate. Z, Zinc plate. Fig. 2, Decomposing cell. A, Vessel containing solution of common salt, having a zinc plate, Z, immersed, and connected by a wire with the copper plate C of the battery. B, Glass tube, closed with plaster of Paris, containing a solution of hydrochlorate of ammonia, the amalgamated platinum wire im- mersed in it passing through the cork, and connected with plate Z of the battery. We have just noticed the fact, that under the influence of a weak current, salts can be resolved into their component elements. In this way a compound can be separated into its constituent acid and base. Now it is a remarkable fact, that if an acid and electric solution be so placed that their union be effected through the parietes of an animal membrane, or indeed any other porous diaphragm, a current of elec- tricity is evolved. This fact was first noticed by Becquerel, and has since been found to be true, not only with nitric acid and potass, during whose combination he observed this disturbance of electric equilibrium, but with all other acids and soluble bases. I am anxious to demonstrate the accuracy of this statement to you, although I fear the test I shall use, the deviations of the needle of an astatic. 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
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