Tournefort's principal work was the 1694 "Eléments de botanique, ou Méthode pour reconnaître les Plantes" (the Latin translation of it "Institutiones rei herbariae" was published twice in 1700 and 1719). The principal artist was Claude Aubriet, who later became the principal artist at the Jardin des Plantes. The classification followed was completely artificial, and neglected some important divisions established by earlier botanists, such as John Ray's separation of the phanerogams from the cryptogams, and his division of the flowering plants into monocots and dicots. Overall it was a step backwards in systematics, yet the text was so clearly written and well structured, and contained so much valuable information on individual species, that it became popular amongst botanists, and nearly all classifications published for the next fifty years were based upon it.