It may seem a far cry from the magneto-electrical discoveries of Faraday in the earlier part of the last century to modem wireless, but the chain of invention and discovery is continuous. and Faraday's work is one of its essential links. Sir William Bragg. who will give the talk, is not only a scientist of the highest qualifications (Fullerian Professor of Chemistry to the Royal Institution, and Director of the Davy-Faraday Research Laboratory) but a lecturer whose powers of interesting listeners with little technical knowledge have been amply proved by the extraordinary success of his lectures to children at the Royal Society.