This book is, to all intents and purposes, entirely new. No considerable portion of it has already appeared, although here and there short passages and phrases from articles of bygone years are embedded--indistinguishably, I hope--in the text. I have tried, wherever it was possible, to select my examples from published plays, which the student may read for himself, and so check my observations. One reason, among others, which led me to go to Shakespeare and Ibsen for so many of my illustrations, was that they are the most generally accessible of playwrights.