The first step in Europeans' wresting the means of production was effected by Nicolaes Witsen, the enterprising burgomaster of Amsterdam and member of the governing board of the Dutch East India Company who urged Joan van Hoorn, the Dutch governor at Batavia that some coffee plants be obtained at the export port of Mocha in Yemen, the source of Europe's supply, and established in the Dutch East Indies; the project of raising many plants from the seeds of the first shipment met with such success that the Dutch East India Company was able to supply Europe's demand with "Java coffee" by 1719. Encouraged by their success, they soon had coffee plantations in Ceylon, Sumatra and other Sunda islands. Coffee trees were soon grown under glass at the Hortus Botanicus of Leiden, whence slips were generously extended to other botanical gardens. Dutch representatives at the negotiations that led to the Treaty of Utrecht presented their French counterparts with a coffee plant, which was grown on at the "Jardin du Roi", predecessor of the Jardin des Plantes, in Paris.