An attempt made by Schörling  to disprove the electron group transition theory with his data on Cu, Ni, Fe X-ray spectra  is discussed. In his treatment of experimental data the author of ref.  is shown to have made made errors which led him to incorrect conclusions.
In particular, the author denies the experimentally well established growth of the relative intensity of the Kβ′ sattelite with temperature.
It is demonstrated that the correct treatment of Schörling's experimental data does not contradict, but on the contrary substantiates experimentally the results of the electron group transition theory . It is hoped that the discussion will throw light on the problems involved.