XIV CONTENTS. 



2. Hydrostatics and Hydrodynamics, or the Equilibrium and 

 Motion of Liquid Bodies. 



ARTICLE PAGE 



19. Surface of Liquids. Transmission of Pressure. Pressure in Vessels 158 



20. Communicating vessels. Buoyancy. Principle of Archimedes . 379 



21. Floating Bodies. Hydrometers 191 



22. Fountains. Efflux from Orifices. The Screw-propeller . . 196 



23. Molecular Phenomena. Adhesion. Capillarity. Solubility. Dif- 



fusion. Endosniose .... 204 



3. Aerostatics and Aerodynamics, or the Equilibrium and 

 Motion of Gaseous Bodies. 



24. Weight of Air. Loss of Weight in Air. The Balloon . . 219 



25. Atmospheric Pressure. The Barometer 228 



26. Mariotte's Law 240 



27. Applications of Atmospheric Pressure and of Mariotte's Law . 246 



28. The Air-pump. Experiments with the Air-pump . . . 270 



29. The Suction-pump. The Forcing-pump 291 



30. The Reaction of Efflux in Gases. Phenomena of Suction . 301 



31. Molecular Phenomena in Gases. Condensation upon Surfaces. 



Absorption. Diffusion 316 



ACOUSTICS. 



32. Nature and Propagation of Sound 326 



33. Number of Vibrations. The Siren. Pitch , 344 



34. Vibrations of Strings. Overtones. Resonance. Timbre . . 355 



35. Vibration of Plates, Bells, Rods, and Air in Tubes . . .368 



36. The Organ of Voice. Vowel Sounds. Flame-Manometer . 390 



37. Beats. Concord. Discord . . 404 



OPTICS. 



38. Propagation of Light. Shadow. Photometers . . . 409 



39. Reflection of Light. Mirrors 427 



40. Refraction of Light. Prisms. Lenses ..... 454 



41. Dispersion of Light. The Spectrum . . . . . . 480 



42. The Eye. Vision. Optical Instruments 514 



43. Binocular Vision. The Stereoscope. Various Visual Effects . 533 



