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The polarization of light resulting from the excitation of helium by electrons was measured as a function of the bombarding electron energy. The wavelengths of the light whose polarization was measured are as follows:X=47l3A(4 3 5-^2 3 P),X=4922A(4 1 Z)->2 1 P) J X = 3188A(4 3 i > -^2 3 5),X = 5876A(3 3 D->23p) X=4388 A (5 W -* 2 *P), X = 5016 A (3 IP -> 2 15), X=447l A (4 *D -> 2 3 P), X = 3889 A (3 3 P -> 2 *5). The polarization curves for the different wavelengths were measured for different pressures of the helium gas, and for X = 4922 A, 4388 A, and 5016 A, there is a marked pressure dependence. There is a decided discrepancy between the theory as summarized by Percival and Seaton and the experimental results presented in this paper. No resolution of this discrepancy is given at this time.

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