CONTENTS. xi 



PART III.-FLUIDS AT REST AND IN MOTION: THE 

 MECHANICS OF THE CIRCULATION. 



CHAPTER PAGE 



XIX. HYDROSTATICS . . .188 



XX. HYDRODYNAMICS FLUIDS IN MOTION . 207 



XXI. THE MECHANICS OF THE CIRCULATION . . 222 

 XXII. CAPILLARITY, DIFFUSION OF LIQUIDS, AND 

 OSMOSIS ; THEIR APPLICATION TO THE PHY- 

 SIOLOGY OF ABSORPTION AND SECRETION . 239 



PART IV. PNEUMATICS. 



XXIII. THE PHYSICS OF GASES AND THEIR APPLICA- 

 TION IN RESPIRATION . . . .270 



PART V.-OPT1CS. 



XXFV. LIGHT : REFLECTION AND REFRACTION . . 296 



XXV. THE ACTION OF PRISMS AND LENSES . . .311 



XXVI. ANALYSIS OF LIGHT : COLOUR . . . .319 



XX VII. ABERRATIONS OF LENSES 344 



XXVIII. OPTICAL INSTRUMENTS 349 



XXIX. THE EYE AS AN OPTICAL INSTRUMENT . . 374 

 XXX DOUBLE REFRACTION, POLARISATION, AND IN- 

 TERFERENCE OF LIGHT 397 



PART VI. SOUND. 



XXXI. SOUND: ITS NATURE, REFLECTION, AND RE- 

 FRACTION . 417 



XXXH. MUSICAL SOUND ... . . .423 



XXXIIL SYMPATHETIC VIBRATION AND RESONANCE . 439 



PART VII.-HEAT. 



XXXIV. THE NATURE AND SOURCES OF HEAT . . .451 

 XXXV. CONDUCTION, CONVECTION, AND RADIATION OF 



HEAT . . 456 



