1867. Fourth Edition. 508 pages. No dust jacket. Half bound in blue leather with marbled paper covered boards. Marbled end papers. Gilt edged text block. Rebound. Pages remain clear with minimal tanning and foxing. Ex Libris plate to front paste-down. Some occasional mild cracking to gutters throughout, Cracking to hinges, no damage to end papers. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends with splits to leather. Gilt lettering has become dull.