THE wholo history of man's development in the use of his hands and of his tools can bo traced in the story of the metals that he has, one by one, brought under his sway. In this new series of talks, Professor Desch, of Sheffield University, who is one of the greatest authorities on Metallurgy, will trace man's progress in the mastery of the metals, from the time when only gold was known to him, and that used only for ornament, through the discovery and conquest of bronze, iron and steel, to the strange new alloys and rare metals that the modem laboratory produces for the modern engineer.