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English translation of a Russian article from 1928. Translator's abstract:The article presents general considerations on the validity of thesuperposition principle for light in vacuo from out a quantum theoretic pointof view. It contains a report on an optical experiment designed to detect thephenomenon of photon-photon scattering. To understand the negative result ofthe performed experiment, a consideration of the solar corona is undertaken inorder to derive an empirical upper limit on the photon-photon scattering rate.Source details: S. I. Vavilov: Zamechaniya ob empiricheskoi tochnostiopticheskogo printsipa superpozitsii. Zhurnal Russkogo Fiziko-KhimicheskogoObshchestva pri Leningradskom Universitete, Chast' Fizicheskaya [Journal of theRussian Physico-Chemical Society at Leningrad University, Physical Part], Vol.LX (1928) No. 6, pp. 555-563.

Remarks on the empirical accuracy of the optical superposition principle [Engl. transl. of Zh. Russk. Fiz.-Khim. Obshch., Ch. Fiz. 60(1928)555]