CONTENTS. XI 



CHAPTER XIV. 



ROTATOltY POLARIZATION. 



Page. 



(241) Rotation^of plane of polarization in rock-crystal. (242) Laws of ro- 

 tatory polarization established by Biot. (243) Right-handed and 

 left-handed crystals discoveries of Herschel and Brewster. (244) Laws 

 of rotatory polarization in rock-crystal theoretically explained by 

 Fresnel. (245) Relation between rotation and double refraction in 

 the direction of the axis. (246) Airy's discovery of elliptic polari- 

 zation in directions inclined to the axis. (247) Mac Cullagh's theory 

 of refraction in quartz. (248) Rotatory polarization of liquids dis- 

 coveries of Biot and Seebeck. (249) Rotation of mixtures; optical 

 analysis of compounds. (250) Jellett's analyzer, and saccharometer, . 237 



