[ London ]: [ Macmillan & Co ] 1925. First Separate Edition. [1]-6 pages (last blank). 7 1/2 x 10 3/4 inches. Offprint from Nature, Volume 115, February 7, 1925. Separately paginated (originally 195-199 pages). A worn copy, with browning, creasing and old cellotape repairs (marginal and at the spine)..... More