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The approximate solutions do not difier much numerically for intermediate values of 1, while Tietz' solution has a simpler form. For 1+o my solution decreases too fast and Tietz' solution too slowly. Ifowever, the essentiral difierence lies in the fact that my equation is linear, while Tietz' equation is not. Linearity greatly facilitates the application of the method to molecules, as was shown in my treatment of the HrO molecule.s On the other hand, the extension of Tietz' method to molecules seems to be hardly possible.

Reply to Tietz' Letter: “Approximate Analytic Solution of the Thomas-Fermi Equation for Atoms”