For the summer semester Adorno planned a lecture course entitled "An Introduction to Dialectical Thinking," as well as a seminar on the dialectics of subject and object. But at the first lecture Adorno's attempt to open up the lecture and invite questions whenever they arose degenerated into a disruption from which he quickly fled: after a student wrote on the blackboard "If Adorno is left in peace, capitalism will never cease," three women students approached the lectern, bared their breasts and scattered flower petals over his head. Yet Adorno continued to resist blanket condemnations of the protest movement which would have only strengthened the conservative thesis according to which political irrationalism was the result of Adorno's teaching. After further disruptions to his lectures, Adorno canceled the lectures for the rest of the seminar, continuing only with his philosophy seminar. In the summer of 1969, weary from these activities, Adorno returned once again to Zermatt, Switzerland, at the foot of Matterhorn to restore his strength. On August 6 he died of a heart attack.