CONTENTS. 



LECTURE PAGE 



I. ON THE RELATION OP 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 29 



III. ON THE PHYSIOLOGICAL CAUSES OF HARMONY IN Music. 



Translated by A. J. ELLIS, Esq., M.A., F.R.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 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 . . . .175 



ii. The Sensation of Sight 202 



in. The Perception of Sight 237 



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

 KINSON 277 



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



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



