. The Philosophical magazine; a journal of theoretical, experimental and applied physics. he substance in question, which we will suppose exerts nochemical action on the receiving surface. Now the cohesion-figures of liquids will be more or less permanent in the inverseratio of the solubility of the substance. A drop of one of thefixed oils placed on the surface of water will spread out into afihu, which is characteristic of the substance, and may last someminutes or even hours, according to the degree of force withwhich cohesion reasserts itself. A drop of one of the essentialoils will also g
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. he substance in question, which we will suppose exerts nochemical action on the receiving surface. Now the cohesion-figures of liquids will be more or less permanent in the inverseratio of the solubility of the substance. A drop of one of thefixed oils placed on the surface of water will spread out into afihu, which is characteristic of the substance, and may last someminutes or even hours, according to the degree of force withwhich cohesion reasserts itself. A drop of one of the essentialoils will also give a characteristic film or cohesion-figure whichmay change every moment from evaporation and display somebeautiful effects of colour; but all these phenomena will be cha-racteristic of the substance in question, and will enable it tobe recognized. A drop of a substance like creosote, which isslightly soluI)le in wat(;r, may continue five minutes; a drop ofether or of aleoiiol may last only a fraction of a second; butwhether the time be long or short, these figuics arc typical of the. , Colza O . »^a^-.^- />. H OHESION FIGURES OF LIQUIDS Mr. C. Tomlinson on the Cohesion-Figures of Liquids. 251 substances that produce them; and so sensitive are they to anyvariations in the conditions under which they are produced^ thata slight aheration in one of those conditions leads to a markedchange in the cohesion-figure. Thus the cohesion-figure of wood-spirit on water is very different from what it is on mercury, sincethe surface attraction or adhesion of mercury is very differentfrom that of water. Now let us examine the cohesion-figure of a liquid that issparingly soluble in water, such as creosote. If we deliver a dropof this substance from the end of a glass rod to the surface ofone ounce of water, we may witness a struggle between cohesionand adhesion that will last about five minutes. The creosotesails about on the surface of the water in a state of considerableagitation, disch
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