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Measurements of the paramagnetic susceptibilities of powdered crystals of several salts of the iron group elements have been made over the temperature range 80^ to 300^. The results are in good agreement with the theoretical predictions of Van Vleck and his co-workers in the cases where the theory is applicable. Several of the nickel and cobalt complex salts have susceptibilities which vary in an unusual manner with the temperature.
Rob Janes (Mon,) studied this question.