CONTENTS. 



Page. 

 Introduction 5 



I. Hagen, 1874. The measurement of the resistances experienced hy 



plane plates when they are moved through the air in a direction 



normal to their planes 7 



II. Helmholtz, 1858. On the integrals of the hydro-dynamic equations 



that represent vortex motions 31 



III. Helmholtz, 1868. On discontinuous motions in liquids 58 



IV. Helmholtz, 1873. On a theorem relative to movements that are geo- 



metrically similar, together with an application to the problem 



of steering balloons 67 



V. Helmholtz, 1888. On atmospheric motions; first paper 78 



VI. Helmholtz, 1889. On atmospheric motions ; second paper. On the 



theory of wind and waves « 94 



VII. Helmholtz, 1890. The energy of the billows and the wind 112 



VIII. Kirchhoff, 1869. The theory of free liquid jets 130 



IX. Oberbeck, 1877. On discontinuous motions in liquids 139 



X. Oberbeck, 1882. The movements of the atmosphere on the earth's 



surface 151 



XI. Oberbeck, 1882. On the Guldberg-Mohn theory of horizontal atmos- 

 pheric currents 171 



XII. Oberbeck, 1888. On the phenomena of motion in the atmosphere ; first 



paper 176 



XIII. Oberbeck, 1888. On the phenomena of motion in the atmosphere ; 



second paper 188 



XIV. Hertz, 1884. A graphic method of determining the adiabatic changes 



in the condition of moist air 198 



XV. Bezold, 1888. On the thermo-dynamics of the atmosphere; first paper. 212 

 XVI. Bezold, 1888. On the thermo-dynamics of the atmosphere ; second 



paper 243 



XVII. Bezold, 1889. On the thermo-dynamics of the atmosphere ; third paper 257 



XVIII. Rayleigh, 1890. On the vibrations of an atmosphere 289 



XIX. Margules, 1890. On the vibrations of an atmosphere periodically 



heated """ 



XX. Ferrel, 1890. Laplace's solution of the tidal equations 319 



o 



