Pauli was one of the great physicists of the 20th century. He invented neutrinos, for instance. The Pauli principle explains the Periodic Table and the rigidity of matter. These lectures on quantum mechanics are not the famous Handbuch article which was, for many years, a main reference on QM. These are notes taken by his students (and carefully edited by senior physicists, such as Charles Enz)at his classes. They are much more accessible, being meant for students. Being quite compact, I woulnd't say they are adequate for standard beginning students. They are, however, perfect for clarifying subtle points and have an exquisite elegance, in their simplicity. A friend of mine, an eminent experimentalist, considered it "his bible". An interesting exercise in style is comparing these lectures with the analogous ones by Fermi, in his Chicago lectures. Who wins? My favorite is Fermi's. But it is a close match.