230 INTRODUCTION TO PHILOSOPHY OF SCIENCE 



the examination also involves, so far as nature itself is 

 concerned, the ascertainment of whether the conditions 

 demanded by the experiment have actually been realized. 

 This is a complicated problem requiring both knowledge of 

 the situation and skill in manipulation of instruments. Only 

 those who have experienced the chagrin of a carefully pre- 

 pared experimental lecture-demonstration — which failed at 

 the critical moment to function as predicted — can appreci- 

 ate the complexity of conditions which are here relevant. 

 What is to be emphasized at this point is merely that in a 

 case of infirmation a careful examination of all of the ob- 

 servational and experimental aspects should be made before 

 the hypothesis is rejected. 



With this discussion of verificatory techniques the con- 

 sideration of problems in the logic of science ends. The 

 attempt has been made merely to outline the structure of 

 scientific method and doctrine and to indicate the main 

 types of problem which arise. Concrete application of 

 many of the principles here disclosed will be made in Part 

 Two. 



REFERENCES 



A. D. Ritchie, Scientific Method (London: Kegan Paul, 1923), 



Chap. VI. 

 Frederick Rarry, Scientific Habit of Thought (New York: Columbia 



University, 1927), Chap. III. 

 J. S. Mill, System of Logic (London: Longmans, Green, 7th ed., 



1868), Rook III, Chaps. VIII, IX. 

 W. S. Jevons, Principles of Science (London: Macmillan, 1907), 



Chaps. XIX, XX, XXIII. 

 J. A. Creighton, Introductory Logic (New York: Macmillan, 1922), 



Chap. XIX. 

 A. Wolf, Essentials of Scientific Method (New York: Macmillan, 



1925), Chap. VII. 

 E. A. Rurtt, Principles and Problems of Right Thinking (New York: 



Harper, 1928), Chap. IX. 



