In his laboratory, full of chemical and electrical apparatus, a man who claims to have invented a way of manufacturing diamonds is besieged by many people whom he has cheated out of their money through his alleged process. Finally the president of the diamond mines in South Africa enters, sees a diamond manufactured, and receives it as a present in the form of a scarf pin. The gendarmes enter, drag the impostor to court; but in the midst of exciting and ludicrous legal proceeding the latter knocks the officials over and escapes through the window. There is a hot pursuit in which many obstacles arc encountered and overturned, one of which is a park bench with a couple sitting on it engaged in a lively conversation. The prisoner is at last caught, and we take leave of him making faces from behind the bars at his guards.