KEY AND INDEX 



the story of the application of these principles is full 

 of interest, and in many cases the ingenuity displayed 

 in the application of old principles to new purposes is 

 fully entitled to be described as the work of genius. 

 Indeed such application of theoretical principles to the 

 development of the practical mechanisms through 

 which the entire structure of civilization has been 

 developed constitutes the crowning achievement of 

 scientific investigation. 



CONTENTS BY CHAPTERS 



The summary just presented will serve, perhaps, to 

 give at least a general notion of the scope of our text. 

 A notion still more precise may be gained from a sur- 

 vey of the contents of the successive volumes by chap- 

 ters. Such a Table of Contents is here presented. 

 By glancing at it the reader will be enabled to locate 

 any specific subject as regards its main treatment. 

 The list may, therefore, serve as an index of the most 

 general character, preparatory for the detailed analyses 

 made by the Indexes that follow, which are, as already 

 noted, of three types : 



I. Technical Index and Glossary, in which the 

 technical terms of every department of science are de- 

 fined, with illustrative comment. 



II. Biographical Index: Comprising a full list of 

 the discoverers in every department of science, theoret- 

 ical and practical, with brief sketches of their work. 



III. Encyclopaedic General Index for the text vol- 

 umes, covering fully all the topics treated, with abun- 

 dant cross references. 



It is unnecessary to characterize these indexes in 

 detail, as their titles are in the main self-explanatory, 

 and as the indexes themselves occupy the succeeding 

 pages, making up the bulk of the present volume. 



[4] 



