After a period of his life, traveling overseas visiting exotic locations with a group of young British academics and adventures, among them his second-cousin "Gwyn" Sir
Gwynneth de Candia Vaughan son of
Arthur Powys-Vaughan and countess
Clelia de Candia, daughter of the famous count
Mario the Tenor, David spent the year of 1896 in the
Amazon rainforest and in the summer of 1897 he took a study trip to
Siam and
Malaysia. Along these overseas trips, he acquired extensive botanical data and regional information that eventually became vital to write the research papers that granted him a successful lecturing career, taking postings in renown universities: • From 1896, Assistant Lecturer in botany, at Queen Margaret College in
Glasgow; • In 1905, Assistant Lecturer transferred to
Birkbeck College, and moved to London; • Then, Professorship at
Queen's College, Belfast. • From 1906 to 1908, he won the Society's Makdougall-Brisbane Prize for the period . • In 1910, he was elected a Fellow of the
Royal Society of Edinburgh. His proposers were
Frederick Orpen Bower, Sir
Isaac Bayley Balfour,
Robert Kidston and
John Horne. • In 1914, transferred Professorship to
Reading University, moving from Belfast to Reading, Berkshire. He died in Reading of
tuberculosis on 4 September 1915. ==Publications==