The work of selecting the accounts has been one of time and careful thought.  Many thousands of books have been read and read again.  The cardinal points of consideration in the choice have been:  (1) Interest, that is, vividness of narration; (2) simplicity, for we aim to reach the people, to make a book fit even for a child; (3) the fame of the author, for everyone is pleased to be thus easily introduced to some long-heard-of celebrity, distantly revered, but dreaded; and (4) accuracy, a point set last because its defects could be so easily remedied by the specialist’s introduction to each event.

These considerations have led occasionally to the selection of very ancient documents, the original “sources” of history themselves, as, for instance, Columbus’ own story of his voyage, rather than any later account built up on this; Pliny’s picture of the destruction of Pompeii, for Pliny was there and saw the heavens rain down fire, and told of it as no man has done since.  So, too, we give a literal translation of the earliest known code of laws, antedating those of Moses by more than a thousand years, rather than some modern commentary on them.  At other times the same principles have led to the other extreme, and on modern events, where there seemed no wholly satisfactory or standard accounts, we have had them written for us by the specialists best acquainted with the field.

As the work thus grew in hand, it became manifest that it would be, in truth, far more than a mere story of events.  With each event was connected the man who embodied it.  Often his life was handled quite as fully as the event, and so we had biography.  Lands had to be described—­geography.  Peoples and customs—­sociology.  Laws and the arguments concerning them—­political economy.  In short, our history proved a universal cyclopaedia as well.

To give it its full value, therefore, an index became obviously necessary—­and no ordinary index.  Its aim must be to anticipate every possible question with which a reader might approach the past, and direct him to the answer.  Even, it might be, he would want details more elaborate than we give.  If so, we must direct him where to find them.

Professional index-makers were therefore summoned to our help, a complete and readable chronology was appended to each volume, and the final volume of the series was turned over to the indexers entirely.  We believe their work will prove not the least valuable feature of the whole.  Briefly, the Index Volume contains: 

1.  A complete list of the Great Events of the world’s history.  Opposite each event are given the date, the name of the author and standard work from which our account is selected, and a number of references to other works and to a short discussion of these in our Bibliography.  Thus the reader may pursue an extended course of study on each particular event.