of discarding something and then later regretting it. Carl Jung speculated that the widespread appeal of collecting is connected to the hunting and gathering that was once necessary for human survival. Collecting is also associated with memory by association and the need for the human brain to catalogue and organise information and give meaning to ones actions. History Collecting is a practice with a very old cultural history. In Mesopotamia, collecting practices have been noted among royalty and elites as far back as the 3rd millennium BCE. The Egyptian Ptolemaic dynasty collected books from all over the known world at the Library of Alexandria. The Medici family, in Renaissance Florence, made the first effort to collect art by private patronage, this way artists could be free for the first time from the money given by the Church and Kings; this citizenship tradition continues today with the work of private art collectors. Many of the world's popular museums—from the Metropolitan in New York City to the Thyssen in Madrid or the Franz Mayer in Mexico City—have collections formed by the collectors that donated them to be seen by the general public. The collecting hobby is a modern descendant of the "cabinet of curiosities" which was common among scholars with the means and opportunities to acquire unusual items from the 16th century onwards. Planned collecting of ephemeral publications goes back at least to George Thomason in the reign of Charles I and Samuel Pepys in that of Charles II. Collecting engravings and other prints by those whose means did not allow them to buy original works of art also goes back many centuries. The progress in 18th-century Paris of collecting both works of art and of curiosité, dimly echoed in the English curios, and the origins in Paris, Amsterdam and London of the modern art market have been increasingly well documented and studied since the mid-19th century. The involvement of larger numbers of people in collecting activities came with the prosperity and increased leisure for some in the later 19th century in industrial countries. That was when collecting such items as antique china, furniture and decorative items from oriental countries became established. The first price guide was the Stanley Gibbons catalogue issued in November 1865. On the Internet The Internet offers many resources to any collector: personal sites presenting one's collection, tools for tracking conditions and number of items collected, item identification