John Muir spent the years 1890-1892 studying Arts and Medicine at the
University of St Andrews. He enrolled at the
University of Edinburgh in 1892, obtaining a M.B. and C.M. in 1896, and an M.D. in 1902. In 1896 he came to
Cape Colony and practised at
Worcester, Strydenburg, Sterkstroom and Albertinia before settling in Riversdale. He collected plants extensively in the area as well as seeds found along the coastline. He retired in 1923 to devote himself to these interests as well as the study of shells. He donated his collection of driftseeds to
Stellenbosch University in 1929 for which he was awarded an honorary D.Sc. As the recipient of a Carnegie Travelling Grant, he went abroad to study other collections of ocean-borne fruits and seeds. He presented his herbarium to the National Herbarium, Pretoria. At this time he developed an interest in folklore and historical objects and published a number of papers on the subject, besides contributing vernacular names of birds, plants and shells to the
Woordeboek van die Afrikaanse Taal. He donated his collection of shells to the South African Museum, some particularly minute species exciting a large amount of interest. Besides his botanical writings, he contributed a number of articles to popular scientific and socio-historical publications, a fair portion of these written in
Afrikaans. He is commemorated in the genus
Muiria N.E.Br. and in many species such as
Leucospermum muirii Phillips,
Erica muirii L.Bol.,
Leucadendron muirii Phillips and
Conophytum muirii N.E.Br. His wife, born Susanna Steyn, is also remembered in
Protea susannae Phillips and
Thesium susannae A.W.Hill, while
Muiria hortenseae N.E.Br. was named for his daughter, but is now lumped as a synonym of
Gibbaeum hortenseae (N.E.Br.) Thiede & Klak. Vol. 17 of
Flowering Plants of South Africa is dedicated to him. ==Publications==