Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Hellenic choral theater, the structure for the mys tery play, and the complete inclosed room of the modern stage. It may be considered certain that some of the fundamental laws of dramatic production will remain in force for all time; in general, however, not only the vital requisites of the drama have been found in continuous devel opment, but also the artistic means of producing its effects. Let no one think that the technique of poetry has been advanced through the creations of the greatest poets only; we may say without self-exaltation that we at present have clearer ideas upon the highest art effects in the drama and upon the use of technical equipment, than had Lessing, Schiller and Goethe.