Nicolaes Tulp attended by prominent learned men, who exchanged ideas about anatomy and the chemical processes of the human body. As befits a new praelector, the Guild commissioned a new group portrait of the prominent councilmen and guildmasters. Rembrandt, himself a young man of 26 and new to the city, won this commission and made a famous painting of him: "The Anatomy Lesson of Dr Nicolaes Tulp". This painting, which now hangs in the Mauritshuis museum of the Hague, depicts Tulp dissecting such a criminal's forearm. There has been much speculation as to why the dissection began on the forearm. Rembrandt's event
Nicolaes Tulp an enormous amount of herbs and spices from the East, thanks to the new shipping routes. It became a successful trade and in 1636 there were 66 apothecaries in Amsterdam. Shocked at the exorbitant prices asked for useless anti-plague medicines (Amsterdam was severely hit by the plague in 1635), Dr Tulp decided to do something about it. He gathered his doctor and chemist friends together and they wrote the first pharmacopoeia of Amsterdam in 1636 the "Pharmacopoea Amstelredamensis". The Apothecary guild would require an exam based on Dr Tulp's book in order for new chemists to set up shop in