XV111 CONTENTS. 



PART Y. 



SPECIAL METHODS OF DISCOVERY. 

 CHAPTER . PAGE 



L. SPECIAL EMPIRICAL METHODS OF SCIENTIFIC RESEARCH 453 

 ' Fundamental Laws of Discovery ' 458 



LI. DISCOVERY BY EXTENDING UNDEVELOPED OR NEG- 

 LECTED PARTS OF SCIENCE 466 



LIT. DISCOVERY BY THE USE OF NEW OR IMPROVED INSTRU- 

 MENTS 470 



Lin. DISCOVERY BY INVESTIGATING LIKELY CIRCUMSTANCES 486 



a. By Examining Neglected Truths and Hypotheses, 487. 

 &. By Examining Peculiar or Unexplained Truths in 

 Science, 487. c. By Investigating Unexplained Phe- 

 nomena Observed in Manufacturing and other Opera- 

 tions, 495. d. By the Investigation of Exceptional 

 Cases, 498. e. By Examining Extreme Cases and Con- 

 spicuous Instances, 500. f. By Examining Common 

 but Neglected Substances, 501. g. By Investigating 

 Peculiar Minerals, 503. Ji. By Examining Rare Sub- 

 stances, 504. i. By Examination of the Residues of 

 Manufacturing Processes, 505. j. By Examining- the 

 Ashes of Rare Plants and Animals, 507. 



LIV. DISCOVERY BY DEVISING HYPOTHESES AND QUESTIONS, 



AND TESTING THEM 508 



a. By Searching for one thing and Finding another, 515. 

 &. By Assuming the Truthfulness and Certainty of all 

 the Great Principles of Science, 519. c. By Assuming 

 that most of the Principles which Operate in the Simpler 

 Sciences Operate also in the Complex and Concrete ones, 

 520. d. By Assuming that Statements which are True 

 of one Force or Substance are True to some extent of 

 others, 522. e. By Assuming the Existence of Converse 

 Principles of Action, 522. /. By Assuming the Existence 

 of Complete Homologous series, 524. 



