sentences:  Later he took up the amphibia, on which he eventually became an authority.In January 1900, he was president of the biology section at the meeting of the Australasian Association for the Advancement of Science, and chose for the subject of his address ""The Rise and early Progress of our Knowledge of the Australian Fauna"", a work of much value to all interested in the history of research in the natural history of Australia.In addition to being secretary of the Linnean Society and editor of its Proceedings, Fletcher was an executor of Macleay's will and he had much work in carrying out the provisions of it as financial and legal difficulties arose in connexion with the appointment of a bacteriologist and the foundation of the research fellowships.