CONTEXTS. 10 



ADDITIONS TO TEE THIRD EDITION. 



BOOK YIII. ACOUSTICS. 

 SOUND. 



PAGE 



The Velocity of Sound in Water 599 



BOOK IX. OPTICS. 



Photography 601 



Fluorescence 601 



UNDULATORY THEORY. 



Direction of the Transverse Vibrations in Polarization 603 



Final Disproof of the Emission Theory 604 



BOOK X. THERMOTICS. ATMOLOGY. 



THE RELATION OF VAPOR AND AIR. 



Force of Steam 606 



Temperature of the Atmosphere 607 



THEORIES OF HEAT. 

 The Dynamical Theory of Heat 608 



BOOK XI. ELECTRICITY. 



General Piernarks 010 



Dr. Faraday's Views of Statical Electrical Induction 611 



BOOK XII. MAGNETISM. 



Recent Progress of Terrestrial Magnetism 613 



Correction of Ships' Compasses 616 



