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. 1 6, 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. 



