sentences:  In 1910 he and his wife departed Lourenço Marques for Kenya and Uganda, collecting in the Aberdare Mountains and returning with a new species of tree "Lobelia".From 1913 on he added few specimens to his collection, which even so numbered about 16,000 by 1916 when he donated the entire collection to the National Herbarium in Pretoria.In 1917 he retired to his farm Mosdene on the Springbok Flats near Naboomspruit north of Pretoria.