By Louis Rosenfeld

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Since the boundaries are arbitrary, albeit convenient, we should expect colloidal solutions to have many properties in common with true solutions and coarse suspensions, and this is so. Many specific properties show no sudden or abrupt change when passing from one type of dispersion system into the other. Hence the fixing of boundaries must be considered arbitrary. Graham recognized this when he stated that " . . in nature there are no abrupt transitions, and that distinctions of class are never absolute .

If a cone of sun-rays be thrown by a lens into the fluid, the illumination of the particles within the cone shows their presence as undissolved bodies" (Faraday, 1857). A few years later, another English physicist, John Tyndall (1820-1893) (Fig. 2), made use of this discovery in a systematic study of liquids, as well as gases, containing extremely minute particles in suspension and discovered that the light reflected from these particles is plane polarized (Tyndall, 1869). " Protein solutions exhibit this phenomenon.

A. W. Hoffmann, a pupil of Liebig, in his eulogy of Wöhler in 1882, described "the synthesis of urea" as "an epoch-making discovery," and it was so regarded by others (Hopkins, 1928; Warren, 1928) on the occasion of the centennial observation. ] With the impetus of Wöhler's discovery and the development of more proficient analytical techniques, the explanation of life came increasingly in chemical terms. The transition from a doctrine of vital forces to a unified scheme of chemistry was a function of time and the steady accumulation of contradictory evidence.

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