Free public domain sheet music from IMSLP / Petrucci Music Library
It is unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (like China, Japan, Korea and many others worldwide). As this work was first published before 1923 or failed to meet notice or renewal requirements to secure statutory copyright, it is almost certainly public domain in the USA as well.
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London: Office of "Musical Opinion", 1920.
Public Domain - Non-PD EU [tag/del]
First Segment is a Color Scan.
No title is given to the chapters, but chapter 1 is prefatory, chapter 2 concerns itself with certain aesthetic and artistic questions and especially though not solely the question of simplicity, chapter 3 might be titled "The Musical Meaning of the Leitmotif", chapter 4 Characterization in Parsifal, while chapter 5 is an epilogue.