If under the following book titles it is said ”Add” it means that the new data are an addition to the ”Dates of Publication” by Stearn and van Steenis-Kruseman in Fl. Mal. I, 4 (1954) clxiii-ccxix, or to later information published in this Bulletin, parts 11-14, 1955-1959. I am indebted to Prof. Dr H. Merxmüller and his collaborators at Munich for data found in the ”Allgemeine Bibliographie” (Leipzig, vols 1-14, 1856-1869). Dr F.A. Stafleu was so kind to draw our attention to a French publication on the works of Lamarck and gave us permission to extract it here.