20 CONTENTS. 



BOOK XIII. VOLTAIC ELECTRICITY. 

 MAGNETO-ELECTRIC INDUCTION. 



FiGE 



Diaraagnetic Polarity 020 



Magneto-optic Effects and Magnecrystallic Polarity 621 



Magneto-electric Machines 623 



Applications of Electrodynamic Discoveries 623 



BOOK XIY. CHEMISTRY. 



THE ELECTRO-CHEMICAL THEORY. 

 The Number of Elementary Substances 625 



BOOK XV. MINERALOGY. 



Crystallography 627 



Optical Properties of Minerals 629 



Classification of Minerals 630 



BOOK XVI. CLASSIFICATORY SCIENCES. 



Recent Views of Botany 631 



" " Zoology 634 



BOOK XVII. PHYSIOLOGICAL AND COMPARATIVE ANATOMY. 



VEGETABLE MORPHOLOGY 636 



ANIMAL MORPHOLOGY 638 



Final Causes. . 642 



BOOK XVHI. 



'JEOLOdY . 646 



