The Riddle of the Universe by Ernst Haeckel
1929. First Edition Thus. 324 pages. No dust jacket. Brown illustrated cloth boards with lettering. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Pencil markings to front pastedown. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Lettering is darkened. Moderate tanning to spine and edges with crushing to spine ends. Minor splits to spine ends and corners causing cloth to be frayed. Visible wear marks to boards.