"These are the lecture notes as Fermi prepared them in his own hand the last time he gave the course in quantum mechanics at The University of Chicago in 1954. Fermi wrote them directly on hectrograph masters so that copies could be distributed to students who were following the lectures. They have been reproduced in facsimile in order to preserve in as personal a way as possible that unique quality of Fermi's for lecturing simply and clearly on the most essential aspects of a difficult but important subject."--Page 4 of cover.