The Philosophical magazine; a journal of theoretical, experimental and applied physics . Fid. K,. Dr. Bolley on the Theory of Dyeing. 483 All the phacnomena of attraction may be divided into threegroups. The first comprises those whose results we call chemical com-binations, consisting of the approximation of atoms or atomgroups, where the physical properties of the product are entirelydifferent from those of its components. The second consists of those immediate approximations ofatoms or atom groups which can only occur when the form andsize of the atoms render it possible; it includes what a
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Fid. K,. Dr. Bolley on the Theory of Dyeing. 483 All the phacnomena of attraction may be divided into threegroups. The first comprises those whose results we call chemical com-binations, consisting of the approximation of atoms or atomgroups, where the physical properties of the product are entirelydifferent from those of its components. The second consists of those immediate approximations ofatoms or atom groups which can only occur when the form andsize of the atoms render it possible; it includes what are ordi-narily called the phsenomena of cohesion. Persoz* explains howthese two classes of phrenomena, generally described as altogetherdistinct, are really very similar. The third class of ])ha3nomena, which has been less accuratelyinvestigated, stands further removed from either of the formerthan they from each other. It includes the attraction betweengases and porous bodies, the union of gases in the presence ofporous bodies (catalysis), the absorption of certain gases in water,the separat
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