CONTENTS. XIX 



CHAPTER PAGE 



LV. DISCOVERY BY MEANS OF NEW EXPERIMENTS AND 



METHODS OF WORKING 524: 



a. By Making, or Repeating in a Modified Form, 

 Experiments Suggested by other Persons, 543. 

 I. By Extending the Researches of others, 544. 

 e. By Using Known Instruments or Forces in a 

 New Way, 546. d. By Making Converse Experi- 

 ments to those already Known, 548. e. By Subject- 

 ing a Series of Forces or Substances to similar New 

 Conditions, 549. /. By Examining the Effects of a 

 particular Force upon Substances, 550. g. By Ex- 

 amining the Effect of Mutual Contact of Substances 

 upon each other, 555. li. By Examining the In- 

 fluence of Time upon Phenomena, 557. i. By 

 Investigating the Effects of Extreme Degrees of 

 Force on Substances, 559. ,;. By Employment of 

 Instruments of very Great Power, 560. 



LVI. DISCOVERY BY MEANS OF ADDITIONAL, NEW, OR 



IMPROVED OBSERVATIONS 563 



a. By Additional or New Observations with Known 

 Instruments or by Known Methods, 565. b. By 

 Employing New or Improved Modes or Instruments 

 of Observation, 572. c. By Means of more Intelli- 

 gent and Acute Observation, 574. d. By the Com- . 

 bined Efforts of many Observers, 575. 



LVII. DISCOVERY BY CLASSIFYING AND COMPARING KNOWN 



TRUTHS 576 



a. By Simple Comparison of Facts or Phenomena, 577. 

 5. By Comparison of Facts with Hypotheses, 579. 

 c. By Comparing Facts and Collecting together 

 Similar ones, 580. d. By Comparing Collections of 

 Facts with each other, 581. e. By Arranging a 

 Collection of Facts in Particular Orders, and Com- 

 paring the Orders, 583. 



LVIII. DISCOVERY BY MEANS OF STUDY AND INFERENCE . 583 



