Sarel J. van der Walt qualified as a veterinarian (BVSc) in 1936 at the Veterinary Faculty of the University of Pretoria at Onderstepoort and then joined the Section Toxicology of the Veterinary Research Institute. In 1943 he obtained a DVSc degree, also at the University of Pretoria. His research focussed mainly on the toxicity of various plants and was carried out partly in collaboration with D.G. Steyn*. From 1939 to 1946 Van der Walt published a series of seven papers under the title "Recent investigations into the known and unknown poisonous plants of South Africa" in the Onderstepoort Journal of Veterinary Science, continuing a series that had been started by Steyn in 1929. However, he also authored or co-authored some anatomical publications. In 1945 he was appointed state veterinarian in Lydenburg and in 1946 transferred to Pretoria in the same capacity. He held this post until his death in 1949.