22 NOTES TO THE INTRODUCTION. 



are considered more fully in my work on that subject. 

 The Antithesis of Facts and Ideas is treated of in Book i., 

 chapter 2, 3, 4 of that work : Successive Generalizations in 

 chap. 7 : Technical Terms in chap. 8 : Inductive Charts, 

 such as are here referred to in p. 13, are given with re- 

 ference to the History of Astronomy and of Optics, in 

 Book XL, chap. 6, of the Philosophy. Scientific Ideas, such 

 as are here spoken of in p. 16, are discussed in the Philo- 

 sophy, from Book n. to Book x. ; and the principal con- 

 troversies are there noticed by which this discussion has 

 been historically carried on. 



