 Alexander von Humboldt and his botanist travelling companion Aimé Bonpland were able to examine some of Sessé's and Mociño's results in Mexico in the Museum of Natural History in Madrid before their 1799 departure on their five-year sojourn in Spanish America.However, they did not actually meet Sessé and Mociñno; Humboldt said, "circumstances prevented me from benefiting from the advice of these distinguished scientists, whose insights could have been very useful to me.