Oblique scattering of sunlight in gases and liquids.—(1) Theoretical variation with angle. The scattered light is assumed to consist of an unpolarized part whose intensity is the same in all directions and a polarized part whose intensity varies as ($1+{cos}^2\varphi$). This leads to simple equations for the ratio of the two components and for the total intensity for various angles, which are found to agree within 5 per cent with the (2) experimental results for carbon dioxide and for dust-free toluene, benzene and ether. The observed ratios of the intensity for $\varphi =45\mathrm{}$° to that for $\varphi =90\mathrm{}$°, are 1.91, 1.79, 1.71 and 2.12 respectively; the observed ratios of the components for $\varphi =90\mathrm{}$° are.102,.52,.48 and.084 respectively. For carbon disulphide the observed ratio is.704.

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