I reported in the preceding paper, “On Scale-1”, the outcome of the study of the Japanese sardine, with special reference to “Lea's phenomenon”. In this treatise the time of formation of the periodic scale-rings is the subject. I express my gratitude for the instructive advice by Prof. Ikusaku AMEMIYA and for the assistance of Mr. Motokichi MORISHIMA and the late Mr. Kanji TSUTSUMI.
