ENSATIONAL as is the story of the diamond industry in South Africa, quite another aspect fixes the attention of the chemist. The diamonds come out of the mines, but how did they get in ? How were they formed ? What is their origin ?
Gardner Williams, who knows more about diamonds than any man living, is little inclined to indulge in speculation. In his fascinating book he frankly says :
" I have been frequently asked, ' What is your theory of the original crystallisation of the diamond ? ' and the answer has always been, ' I have none ; for after seventeen years of thoughtful study, coupled with practical research, I find that it is easier to " drive a coach and four " through most theories that have been propounded than to suggest one which would be based on any '34