CONTENTS.—Comparative study of American direct current watthour meters [with bibliography]; by T. T. Fitch and C. J. Huber.—Windage resistance of steam-turbine wheels, critical study of experimental data which have been published and of equations for representing them [with list of references]; by E. Buckingham.—Latent heat of fusion of ice; by H. C. Dickinson, D. R. Harper, 3d., and N. S. Osborne.— Observations on ocean temperatures in vicinity of icebergs and in other parts of the ocean; by C. W. Waidner, H. C. Dickinson, and J. J. Crowe.—Accuracy of formulas for ratio, regulation, and phase angle of transformers; by P. G. Agnew and F. B. Silsbee.—Melting points of some refractory oxides; by C. W. Kanolt.