- Wrappers frayed; sm. ticket on frontwr.; frontwr. lacks portion outer edge and partly doubled. Otherwise fine.

= Early reprint edition of the first separate edition, published before in Annalen der Physik, Vierte Folge, vol. 49, p.769-822. This reprint only differs from the first separate edition in the imprint on verso title-page: "Druck von Omnitypie-Ges., Nachfl. L. Zechnall, Stuttgart" [first: "Druck von Metger & Wittig in Leipzig"], imprint on backwrapper is "Metzger & Wittig, Leipzig. 285" and some of the books advertised on backwrapper have the date "1919". Boni 78.1; Weil 80a; PMM 408; Norman Library 696 and cf. 695: "The theory's impact upon twentieth-century science and thought can hardly be overstated."

AND the 5th ed. of the same work.