First Edition. 420pp, 16 black and white photographic plates in middle section, illustrated with numerous diagrams, tables and charts. Blue cloth-covered boards; gilt titles on spine. 8vo. Lightly rubbed spine ends, corners lightly rubbed and rounded. Top text block edge moderately foxed, remaining edges starting to fox, endpapers lightly foxing and tanning. Internally very neat, clean, bright and tight. Dust jacket has moderate shelf wear with multiple closed tears, minor loss and some soiling, not clipped. An analysis of the mechanisms of heredity at the cellular level.
