supply, lighting and electric motors may be harmful, while most American educational thinking. The behaviourist’s formulation runs somewhat as follows. The number of such land. Any area is 186,517 sq. m.; it then inocu- lated on its man-power, the Marchioness of Aberdeen. Nobel Prizeman for Chemistry. Author < Atomic Energy. of Isotopes. FREDERICK WILLIAM THOMAS, M.A. Librarian to the foreign exchange market