IT is good Mat Dr. S. C. Bradford lived to see published his cogent account of the history, princinles organisation, advantages and applications of the Universal Decimal Classification he so pas-sinated believed in and helped so much to develop. It is convenient to find also a recapitulation of his pioneer work establishing the statistical law for the proportions in which articles relating to any particular subject are found distributed among periodicals of varying scope. If, however, "the art of documentation is to make available for mankind the sum total of the results of human work and thought", it was perhaps an instance of faulty classification to borrow the name of that very comprehensive art as the title under which to defend his opinion on the design of one of its tools. No one had a better right to an opinion than the author—si monumentum requieris as to the practical possibilities of the Universal Decimal Classification circumspice in his Science Museum Library—but alternatives exist which a balanced treatise would have to weigh.