Isadora Duncan and Ernst Haeckel first meeting

Ernst Haeckel and Isadora Duncan in front of the Festspielhaus in Bayreuth, Germany, 1904

This photo was never before published. According to book" THE ARYAN CHRIST: THE SECRET LIFE OF CARL JUNG" this photo was taken on the first day of their meeting. Just a few hours later, they sat in the Wagner family's private box and viewed a performance of Parsifal.
Here how Isadora  recalls about Haeckel and their meeting:
When I was in London, I had read the English translations of the works of Ernst Haeckel in the British Museum. I was greatly impressed by his lucid and clear expression of the different phenomena of the Universe. I wrote him a letter expressing my gratitude for the impression his books had made on me. There must have been something in this letter which arrested his attention, for afterwards, when I danced in Berlin, he replied to it.
At that time Ernst Haeckel was banished by the Kaiser, and could not come to Berlin, on account of his free speaking, but our correspondence had continued and when I was in Bayreuth I wrote and asked him to visit me and attend the Festspiel.