London: Methuen & Co.Ltd, 1922, sm. in-8vo, 2 leaves (halftitle & titlepage) + 56 p. + 2 leaves + 8 p. publicity on diff. paper, printed on heavy paper, slightly yellowed, Ex-Libris ‘Edward Wilder Playfair’, full cloth publisher’s binding, blind-stamped title to front, gilt title to spine, spine sunned.
This two lectures were delivered on May 5th, 1920, in the University of Leyden. Its importance was immediately recognized and it was translated into Italian, French, English, Polish, Russian and Hungarian in quick succession. for the first ed. in German cf. Weil 111; Schlipp-Shields n° 131; Alicke 97.
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