Van Vleck describes his Ph.D. work at Harvard University under Edwin Kemble and Percy W. Bridgman; his thesis in classical mechanics; and his post-doctoral research in electric and magnetic susceptibilities, and paramagnetism in particular, which he discusses in some technical detail. He also mentions his research in the quantum mechanics of chemical binding (Ligand Field theory), atomic and molecular spectra, and microwave spectra of molecules--work in the latter area done in conjunction with Victor Weisskopf and Henry Margenau. File also includes a nine-page bibliography.