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herefore the aetherial basis at the same time. In paragraph 852 of his _Experimental Researches_ Faraday writes: "The theory of definite electro-chemical action appears to me to touch upon the absolute quantity of electricity, or electrical power, belonging to different bodies. Although we know nothing of what an atom is, yet we cannot resist forming some idea of a small particle which represents it to our mind, and though we cannot say what electricity is, so as to be able to say whether it is a particular _matter or matters_, or mere motion of ordinary matter, yet there is immensity of facts which justify us in believing that the atoms of matter are in some way endowed or associated with electrical powers to which they owe their most striking qualities, and amongst them their chemical affinity. As soon as we perceive, through the teaching of Dalton, that chemical powers are (however varied the circumstances in which they are exerted) definite for each body, we learn to estimate the relative degree of Force which resides in such bodies; and when upon that knowledge comes the fact that electricity, which we appear to be capable of loosening from its habitation for a while, or conveying from place to place, whilst it retains its chemical Force, can be measured out, and being so measured, is found to be as definite in its action as any of those portions which, remaining associated with the particles of matter, give them their chemical relation, we seem to have found a link which connects the proportion of that belonging to the particles in their natural state." Then in paragraph 855 he writes as follows: "It seems a probable and almost a natural consequence, that the quantity which passes is the equivalent of, and therefore equal to, that of the particles separated, _i. e._ that if the electrical power which holds the elements of a grain of water in combination (or which makes a grain of oxygen and hydrogen, in the right proportions, unite into water when they are made to combine) could be thrown into the condition of a current, it would exactly equal the current required for the separation of that grain of water into its elements again." Further, in Art. 857, he states, "I can have no doubt that, assuming hydrogen as 1, and dismissing small fractions for the simplicity of expression, the equivalent number or atomic weight of oxygen is 8, of chlorine 36, of bromine 78.4, of lead 103.5, of tin 59, etc., notwithstandi
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