Abstract
IN the issue of NATURE for May 3 (p. 19) appeared an abstract of a recent paper by Prof. Kahlenberg on “Osmosis and Osmotic Pressure.” In Prof. Kahlenberg's paper, and also in the abstract, it is claimed that his experiments invalidate van 't Hoff's theory of osmotic pressure, by which the concordance between the pressure of gases and the osmotic pressure of dilute solutions was established. As the basis of that theory seems sometimes to be misunderstood, may I be allowed to recall the principles on which it is founded?
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