ON April 16 and 30 a discussion was held by the Linnean Society under the chairmanship of the president, Dr. E. S. Russell, on “the biogeographic division of the Indo-Australian Archipelago, with criticism of the Wallace arid Weber lines and of any other dividing lines, and with an attempt to obtain uniformity in the names used for the divisions”. The following papers were contributed: Mr. J. B. Scrivenor, “Geological and climatic factors affecting the distribution of life in the Indo-Australian Archipelago” Mr. I. H. Burkill, “A historic account of the divisions which have been proposed” ; Dr. Malcolm A. Smith, “The divisions as indicated by Vertebrata” ; Dr. A. S. Corbet, “The divisions as indicated by the Insecta” ; Mr.H. K. Airy Shaw, “Some general considerations from the botanic standpoint” ; Dr. P. W. Richards, “On the ecological segregation of the Indo-Malayan and Australian elements in the vegetation of Borneo” ; Dr. F. E. Zeuner, “The divisions as indicated by the distribution of insects in relation to geology”.