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stated at this stage that existence of a hysteresis effect, as discovered by Bommel, 2 has been confirmed and that in the normal metal, the absorption does depend strongly on magnetic field (so far applied only along the specimen). This effect was also originally found by Bommel"; in the specimen described here, at the shorter length and at 3.9'K, about 200 oersted will double the amplitude of the transmitted pulse.in the making of the transducer-specimen bond and "H. E. Bommel (verbal communication). also to Dr. H. E. Bommel for early information about his work. (This investigation was started independently without the knowledge that other work was being done, but the discovery of the effect is due to Dr. Bommel. )He also acknowledges with thanks assistance given during the measurements by graduate students and others at Brown University.He would also like especially to thank Dean R. B.Lindsay for his encouragement throughout this work and for making possible his visit to Brown University. He is also grateful to the Headmaster and Governing Body of Charterhouse School for an extended leave of absence.The temperature dependence of the electrical resistivity and Hall coefficient in pand n-type manganesedoped germanium crystals indicates that manganese introduces two acceptor levels in germanium at 0.16&0. 01 ev from the valence band and 0.37&0.02 ev from the conduction band. The distribution coeflicient for manganese in germanium is (1.0+0.2)X10 . Comparison is made with other fourth-row metals (V, Fe, Co, and Ni) as impurities in germanium.

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