Pp. 513-523 in Annalen der Physik, Vierte Folge, Band 4. Whole volume offered. (8vo) 8¼x5½, quarter morocco, spine lettered in gilt. First Appearance, Journal Issue.

Einstein's first published paper, dealing with intramolecular forces. This paper "shows how, from the start, Einstein was groping for universal principles, in the present case for a relation between molecular forces and gravitation" (Pais, Subtle is the Lord, p.57). Weil 1.