CONTENTS. 



LECTTIRB PAGE 



I. On the Eelation of Natural Science to Science in 

 General. Translated by H. W. Eve, Esq., M.A., F.C.S., 

 Wellington College 1 



II. On Goethe's Scientific Researches. Translated by H. W. 



Eve, Esq 33 



III. On the Physiological Causes of Harmony in Music. 



Translated by A. J. Ellis, Esq., M.A., F.R.S. . . .61 



IV. Ice and Glaciers. Translated by Dr. Atkinson, F.C.S., 



Professor of Experimental Science, Staff College . . .107 



V. On the Interaction of the Natural Forces. Translated 



by Professor Tyndall, LL.D., F.KS 153 



VI. The Recent Progress of the Theory of Vision. Translated 



by Dr. Pye-Smith, B.A., F.R.C.P., Guy's Hospital : 



I. The Eye as an Optical Instrument . . . .197 



II. The Sensation of Sight 229 



m. The Perception of Sight 270 



VII. On the Conservation of Force. Translated by Dr. At- 



kinson .317 



VIU, On the Aim and Progress of Physical Science. Translated 



by Dr. W. Flight, F.C.S., British Museum , . . .363 



