(Leipzig, Barth, 1910). 8vo. Extracted from "Annalen der Physik IV, Bd. 33" pp. 1096-1104 and pp. 1105-1115. Fine and clean. Supplied with a facsimile wrapper from the offprint to the first paper.
Both works in first edition. - Weil No. 34 and 35.
Order-nr.: 29307