In his 1816 work, Topographie de tous les vignobles connus, Jullien created the most comprehensive cataloging of the world's wine region ever done up to that point. In addition to describing the well known European wine region, Jullien also described Cossack winemaking techniques used in Ekaterinoslav, wine styles of Hindu Kush and Astrakhan, and surveyed the vineyards of several islands in the Atlantic and Indian Oceans. On the islands of Madeira, he compared the dry wines made from Sercial to the great wines of the Rhine-a description that would support the apocryphal belief that the Madeira grape descended from the German wine grape variety Riesling. In Madeira, he also described unusual aging methods employed on the island, such as the tradition of burying oak barrels of wine in a pit for 6 months underneath layers of horse manure.