PRACTICAL sociology has never had two more expert exponents than Mr. and Mrs. Sidney Webb. They are admittedly unrivalled in the handling of the complicated masses of facts— and, still more intricate, documents in which facts may or may not lie concealed-which are the raw material of social, political, and economic history and theory. In the serios of four talks, of which this evening's is the first, Mrs. Webb will explain by what methods it is possible to arrive at new truth.