Two of Weingartner's books:

"Die Symphonie nach Beethoven" and "Über das Dirigieren". Please click on the covers.

In his autobiography Weingartner said:
"My Bayreuth treatise was received as the outpouring of my wounded ambition, credited with my personal desire for revenge and all other kinds of motives, except the right one, which was, as I explained in the preface to the second edition, 'to discuss my youthful ideal'". That "revenge", as he further explains in this preface, was alleged to be "against Frau Wagner because I was never invited to conduct at the Festival", an allegation which he rejected as beneath contempt. His revelations were, he said, "denounced within the devoted circle of hangers-on as crimen laesae majestatis or, as they say in German, the unpardonable crime of insulting Frau Wagner".

Weingartner's infamous Bayreuth treatise:

Twenty years had passed before it was found possible to repeat Richard Wagner's Ring des Nibeiungen in the theatre which had been specially designed for the purpose. The "Teutonic Spirit" upon which Wagner had relied when projecting and carrying out his gigantic work had played him false... (the whole article is here...)