Dissertations from the Instituut-Lorentz: 1961-1970 1961: J. Vlieger On the quantum-statistical basis of non-equilibrium thermodynamics 1964: R.H. Terwiel On the theory of optical activity 1964: E. Braun Guitler Contribution to the statistical mechanical theory of Brownian motion 1965: H.W. Capel The hole-equivalence principle, the Van Vleck relation and the application of the theory of d-ions in Ligand fields 1966: J. van der Linden On the foundation of classical statistical physics 1967: F.A. Berends Photoproduction of pi-meson 1968: J.B. Sanders On penetration depths and collision cascades in solid materials 1970: P.J.M. Bongaarts An elementary C* algebra field theory