Sir John M'Fadyean was principal of the Royal College of Veterinary Surgeons and a microbiologist in London. Arnold Theiler collaborated with him.
Black/white photo. Original document size: (w)4.96 x (h)7 cm. Original scanned size: 295 kb JPEG, 600 dpi. Final web-ready size: 31.01 kb. Estimate download time: 12 sec. @ 28.8 kbps. Original TIFF file housed at the Dept. Veterinary Tropical Diseases, University of Pretoria. Metadata assigned by Prof. R.C. Tustin, Professor Emeritus: DVTD. His academic and professional experience includes: veterinarian for 54 years,
senior lecturer at UP for 7 years, head of Department at UP for 17 years and Veterinary Council for 3 years.