This principle in the arrangement of thought does not appear in the plays of Euripides, in the works of Antiphon, or in the medical writers. The later speeches in Thucydides' history do not contain this arrangement of thought but are more akin in technique to the speeches of Antiphon and Euripides. It is therefore a probable conclusion that Thucydides wrote I.1-19 and the general arrangement of I.23.4-2.1 within the period 431-411 B.C. or (if we exclude the example in the Electra) 431-421 B.C. If so, it is probable that he wrote these parts of Book 1 before he composed the history of the latter part of the Archidamian War.