Abstract
This paper deals with Kramers' application of Bohr's correspondence principle to the calculation of line intensities. His results of the Stark effect of hydrogen lines were favorably accepted by.the contemporary quantum physicists. One reason for this is there existed no competitive mathematical manipulation other than Kramers' in the period of old quantum theory. The critical appraisal was later given by SchrSdinger in terms of wave mechanics. However, SchrOdinger's theoretical calculation also contained some disagreement with Stark's empirical results in 1915. This discrepancy was soon eliminated by the more elaborated experiments in 1929. New experiments confirmed the validity of Schrodinger's theoretical result.
