Between 1902 and 1907, with funding from the botanist Harry Bolus, he read medicine at Guy's Hospital in London and then travelled in Europe, America and the East Indies.
Thoday was Harry Bolus professor of botany, University of Cape Town and later professor at the University College of North Wales 1923-1949.
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The Bolus Herbarium was established in 1865 from a donation by Harry Bolus of his extensive herbarium and library to the South African College, which later became the University of Cape Town.