In order to give the reader some chance of havinga good Collection of Headings, and less chance ofomitting the important Headings, I have offered (e.g.on pp. 83, 92) a few General Lists, which are not quitecomplete but yet approach to completeness ; two ofthese Lists will be found sufficient for most purposes.One of these is called the List of Period- Headings,such as Geography, Religion, Education, Commerce,War, etc. (see p. 83); the other is called the List ofGeneral Headings, and includes Instances, Causes andHindrances, Effects, Aims, etc. : this latter List will befound on p. 92.

pages 83 and 92. Ihave called theni 'General Lists'