1930. First Edition. 64 pages. Signed by the author. Yellow covers with blue lettering to spine and front. Signed by the author with dedication to front free endpapers. Inserted lecture programme dated 1931 by author (not original to book). Glue firm with only slight cracks to gutters. Pages remain bright and clear with minimal tanning and foxing. Covers have mild edge wear with slight rubbing to surfaces. Slight bends to side edges of covers. Couple of bends to back cover corners. Heavy tanning all over with lettering darkened, especially spine which has severe tanning.