EDITOR'S INTEODUCTION. ix 



scriptions of geographical localities. The branch 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 that relates to organic nature or to meteorol- 

 ogy, or descriptive astronomy may be placed in this 

 class. 



Second Division. Whatever relates to physics or 

 natural philosophy, 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 and biography and eth- 

 nology. Books relating to the lives of individuals, and 

 especially to the social hfe of the nation, and to the 

 collisions of nations in war, as well as to the aid that 

 one gives to another through commerce in times of 

 peace; books on ethnology relating to the manners 

 and customs of savage or civihzed peoples ; books on 

 the primitive manners and customs which belong to 

 the earliest human beings — books on these subjects be- 

 long to the third class, relating particularly to the hu- 

 man will, not merely the individual will but the social 

 will, 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 included 

 under the term civics or the duties of citi^ienship. 



