E. Garbozi, D. Bentz, and N. Martys, Digital Images and Computer Modelling. R. Lenormand, Visualization of Flow Patterns in 2D Model Networks. Y. Yortsos, Probing Pore Structures by Sorption Isotherms and Mercury Porosimetry. P.-Z. Wong, Conductivity, Permeability, and Electrokinetics. P. Nagy, Acoustics and Ultrasonics. S. Sinha, Small-Angle Scattering of Porous Materials. K. Langley and I. Teraoka, Light Scattering and Other Optical Methods. M. Coles, X-Ray Imaging. R. Kleinberg, Nuclear Magnetic Resonance. P. Chang, A.T. Watson, and C. Edwards, NMR Imaging of Fluids and Flow in Porous Media. J.-P. Hulin and D. Salin, Acoustical and Electrical Methods for the Study of Fluid Mixing in Porous Media. Subject Index.