They are pla be asl.cd to read the chapters beano~ on the lc:cturc. This brief introduction to magnetism and the co ncluding essay on superconductivity are la rgely self-contained. Following a review of atomic magnetism, we examine how it is modified in a solid environment, explore exchange and other magnetic interactions, and apply the resulting models to magnetic ordering. Crystalline defects can be studied as soon as crystals themselves have been introduced, though parts of earlier c hapters are occasionally referred to. Homogeneous a nd inhomogeneous semiconductors can be examined at any point after the introduction of Bloch's theorem and the elementary discussion of semiclassical mechanics. None of the chapters on lattice vi brat ions rely on the usc of normal mode raising and lowering operators these are described in several appendices for readers wantmg a more advanced treatment. The ways in which phonon spectra are measured, and the special problems associated with phonons in metals are surveyed at an elementary level, though some parts of these last fottr chapters might well be reserved for a more advanced course. ith the classical and quantum aspects of the harmonic crystal treated separately. Latttce dynamics is given an elementar) introduction, v. Our description of the conventiona l classifica tion of solids lists those solid propcnics tha t cannot be understood without their consideration. Work fu nctions and other surface properties (18] can be taken up at any time after the discussion of translational symmetry in real space. Except for the discussion of screening, an elementary course might also bypass 1he essays on wha t is overlooked by the relaxation-time approximation and by rhe neglect of electron-electron interactions. Of the ba nd structures of actual metals is readily incorporated into an elementary course. ' Referenet.'S to chapter nurnbe~ are given in bnu::ko:~.
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