CONTENTS 



I. INTRODUCTION AND KEY, outlining the general schemeof the 

 entire work and giving complete tables of contents by chapters. 



II. TECHNICAL INDEX AND GLOSSARY, in which the tech- 

 nical terras of every department of Science are defined, with 

 illustrative comment. 



III. BIOGRAPHICAL INDEX, comprising a full list of the dis- 



coveries in every department of Science, theoretical and practical, 

 with brief sketches of their work. 



IV. ENCYCLOPAEDIC GENERAL INDEX, covering fully all the 



topics treated, with abundant cross-references. 



