Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; Messrs. Longmans, Green and Co., Ltd., 39 Paternoster Row. EC4 Informs Longmans, Green and Co that they can expect permission to reproduce in Prof. [Edward Charles Cyril] Baly's book on Spectroscopy, Vol. II, the 2 fugures found in Transactions A.222 and Proceedings A.105. Subject to the consent of the authors, Prof. [Thomas Ralph] Merton and Prof. [Victor] Henri. The articles in question are ['The analysis of the absorption spectrum of naphthalene vapour.—Structure and activationof the molecule of naphthalene'] and ['Bakerian Lecture.–On the spectrum of hydrogen']. 2 July 1926