He visited the islands of Bonaire, Curaçao and Aruba in the West Indies (1881–1882), and investigated the guano deposits and geology of these islands.
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In 1860 he went to the guano island of Sombrero as resident chemist, and continued there until 1864, also making studies of its geology and natural history, especially of its birds and land shells.
Alexis de Tocqueville | Julien Duvivier | Julien Temple | Alexis Bledel | Alexis Korner | Thaïs St Julien | Isaac Julien | Pauline Julien | Julien Clerc | Julien Cahn | Alexis Ohanian | Alexis of Russia | Alexis Carrel | Alexis Boyer | Julien Kerneur | Alexis Taylor | Alexis Michaelides | Alexis Denisof | Alexis Creek | Willibald Alexis | Saint-Julien-les-Villas | Louis Alexis Desmichels | Julien Louis Geoffroy | Julien Lepers | Julien Dubuque | Julien Courbet | Julien Cosmao | Julien Bonnaire | Julien Benda | Julien Balkany |
Opposite the gateway, in Winkle Street, is the only other remaining substantial part of the original hospital, the Church of St. Julien.