The Gouy diffusiometer

Abstract
The application of the modified ray theory given by Kegeles & Gosting (1947) to the Gouy diffusiometer (Coulson, Cox, Ogston & Philpot 1948) has been tested. It has been shown that experimental results, both with single homogeneous substances and with mixtures, agree well with its predictions. A simple method for analyzing the diffusion data given by a mixture of two diffusing substances has been worked out and has been applied to the correction of the apparent diffusion constant of lactoglobulin contaminated by some heterogeneous material and to known mixtures of lactoglobulin with sucrose and potassium chloride. The necessary computations have been performed over a useful range of the variables and the results tabulated. Certain improvements in the experimental technique are described.
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