London: Macmillan & Co. Ltd., 1927.
First English-language edition. x, 195; xii, 410, ; 326,  pp. Complete in three volumes, all bound in publisher's dark green ribbed cloth gilt lettering and ruling to spines. Near Fine with rubbing to cloth, former owner's name neatly written on front free endpaper of first volume, hinges a little free. Uncommon. A major work by the Nobel-winning Dutch physicist published shortly before his death. Item #140942656