On the constitution of atoms and moleculesNote 28 — PART II.—SYSTEMS CONTAINING ONLY A SINGLE NUCLEUS [23] [24].Reading editionComp. J. W. Nicholson, Month. Not. Roy. Astr. Soc. 72. p.52(1912).◇Copy noteReturn to PART II.—SYSTEMS CONTAINING ONLY A SINGLE NUCLEUS [23] [24].