The London, Edinburgh and Dublin philosophical magazine and journal of science . :— 1. In neutral ferrous salts, if one of the two equal iron elec-trodes is magnetized, there is no electromotive force producedwhich amounts to 0-00001 volt. The currents observed by Grossand others could not be referred to a change of the electrochemicalpotential of the magnetized iron. 2. The forces produced by magnetizing a circuit which containsmagnetic substances as electrodes are to be ascribed to variationsof concentration which the magnetized electrode produces whendissolved. 3. In the case of ferric salt
The London, Edinburgh and Dublin philosophical magazine and journal of science . :— 1. In neutral ferrous salts, if one of the two equal iron elec-trodes is magnetized, there is no electromotive force producedwhich amounts to 0-00001 volt. The currents observed by Grossand others could not be referred to a change of the electrochemicalpotential of the magnetized iron. 2. The forces produced by magnetizing a circuit which containsmagnetic substances as electrodes are to be ascribed to variationsof concentration which the magnetized electrode produces whendissolved. 3. In the case of ferric salts, the direction of the currents pro-duced by magnetization depends almost exclusively on their degreeof concentration at the two electrodes. 4. If only ferrous salts are present, the direction of the currentsproduced by magnetization depends on the total concentration ofthe iron salts. 5. The currents designated by Eowland as primary ones areagitation-currents.—Wiedemanns Annalen, No. 7, 1896. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [FIFTH SERIES.] OCTOBER 1896 XXXI. Osmotic Pressure. By J. H. Poynting, Sc. D., , Professor of Physics, Mason College, Birmingham*. SINCE the osmotic pressure of a solution is of the sameorder as the gas pressure of the dissolved substanceat the same density, we are naturally tempted to think of itas an extra pressure produced by the motion of the dissolvedmolecules. But if we start from this supposition we soon findourselves surrounded by the difficulties of the dissociationhypothesis. These are so great that it appears worth whileto examine our ideas of liquid structure in the hope that theywill suggest to us some hypothesis which will free us fromthe necessity of assuming dissociation. I shall try to show in this paper that osmotic pressure maybe accounted for as an indirect result arising, not from disso-ciation but from its very opposite, the greater complexity ofthe molecules in the solution,
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