Second Order Stark Effect in Hydrogen

Through the kindness of Dr. T. Takamine, I received some information about very accurate experimental determinations of the second order Stark effect in hydrogen, carried out by Professor M. Kiuti. Unfortunately this material came too late to be used in my article on the Stark effect (Phys. Rev., 28, p. 695, 1926), therefore, I should like to make these beautiful observations available to a larger public through the agency of Science.