Рецензия на книгу: 1. A. KÖNIG. Physiologische Optik. Handbuch der Experimentalphysik. Herausgeg. v. W. Wien und F. Harms. Band 20, Teil 1. Akademiache Verlagsgesellschaft. Leipzig. 1929, Pp. 241. 2. DOROTHY ADAMS. Dark Adaptation. (A. Review of Literature). Medical Research Couneil; Reports of the Comitee upon the Physiology of Vision. H. M. Stationery Office. London, 1929, Pp. 138.