This set of four, apparently unique, seventeenth century copperplate engravings, known as The Four Seasons, are of probable German or Flemish origin. Each depicts a season of the year with each season used as a metaphor for one of the "ages of man." They are by no means limited to their most obvious subject, anatomy, but contain at the very least allusions to alchemy, astronomy, astrology, zoology, botany, geography, physiology, urology, and palmistry. Each engraving includes many complex parts involving multiple layers of superimposed paper flaps and volvelles.

Previously in the possession of Sir D'Arcy Power, the engravings were sold at auction upon his death and eventually made their way by means of antiquarian bookseller, Henry Schuman, into the collection of Dr. Trent. A group of European scholars under the direction of Dr. H.F.J. Horstmanshoff at Leiden University have been studying The Four Seasons for a number of years; their research has resulted in a manuscript which is now ready for publication.