Hi David
Thank you for your response

I have found at South African archives this (below) and still need to order a copy of it. Have not found, as yet, how to get a copy of C J Douglas's testimony. A little about them (CJ and AE) is mentioned in this (
upetd.up.ac.za/thesis/available/etd-0307...icted/06chapter6.pdf) Is there somewhere else that the testimony would be held?:
DEPOT NAB SOURCE AGO TYPE LEER VOLUME_NO I/8/73 SYSTEM 01 REFERENCE 367A/1900 PART 1 DESCRIPTION APPLICATION BY DANIEL JACOBUS DE WAAL FOR APPOINTMENT OF COMMISSION TO TAKE EVIDENCE OF DR. CHARLES, JAMES DOUGLAS FOR USE AT DE WAAL'S TRIAL. STARTING 19000000 ENDING 19000000