CONTENTS. 



LECTUBB PAGE 



I. ON THE KELATION 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 EESEARCHES. Translated by H. W. 



EVE, Esq 29 



III. ON THE PHYSIOLOGICAL CAUSES OF HARMONY or Music. 



Translated by A. J. ELLIS, Esq., M.A., F.K.S. . .53 



IV. ICE AND GLACIERS. Translated by Dr. ATKINSON, F.C.S., 



Professor of Experimental Science, Staff College . . .95 



V. ON THE INTERACTION OF THE NATURAL FORCES. Translated 



by Professor TYNDALL, LL.D., F.R.S. . . . . .137 



VI. THE EECENT PROGRESS OF THE THEORY OF VISION. Translated 

 by Dr. PYE-SMITH, B.A., F.R.C.P., Guy's Hospital . 



L The Eye as an Optical Instrument . . . .175 



n. The Sensation of Sight . . . . . .202 



m. The Perception of Sight . . . . . .237 



VII. ON THE CONSERVATION OF FORCE. Translated by Dr. AT- 

 KINSON . .277 



VIII. ON THE AIM AND PROGRESS OF PHYSICAL SCIENCB. Translated 



by Dr. W. FLIGHT, F.C.S., British Museum . . .319 



