EDITOR'S INTRODUCTION xi 



scriptions of geographical localities. The l^ranch of 

 study in the district school course which corresponds 

 to this is geography. Travels and sojourns in distant 

 lands ; special writings which treat of this or that 

 animal or plant, or family of animals or plants ; any- 

 thing tliat relates to organic nature or to meteorol- 

 ogy, or descriptive astronomy may be placed in this 

 class. 



Second Dimsion. Whatever relates to physics or 

 natural pliilosophy, to the statics or dynamics of air or 

 water or light or electricity, or to the properties of 

 matter ; whatever relates to chemistry, either organic 

 or inorganic — books on these subjects belong to the 

 class that relates to what is inorganic. Even the so- 

 called organic chemistry relates to the analysis of 

 organic bodies into their inorganic compounds. 



Third Division. History, biogi-aphy, and ethnol- 

 ogy. Books relating to the lives of individuals ; to 

 the social life of the nation ; to the collisions of na- 

 tions in war, as well as to the aid that one nation 

 gives to another through commerce in times of peace; 

 books on ethnology relating to the modes of life of 

 savage or civiHzed peoples ; on primitive manners 

 and customs — books on these subjects belong to the 

 third class, relating particularly to the human will, 

 not merely the individual will but the social ^vill, 

 the will of the tribe or nation ; and to this third 

 class belong also books on ethics and morals, and 

 on forms of government and laws, and what is in- 

 cluded under the term civics, or the duties of citi- 

 zenship. 



