Measurements were made of the flow of helium, methane, ethane, butane, and toluene through thin disks of coal. All measurements were made on a dense layer in the Pittsburgh seam identified as attritus. Flow increased with pressure differential and temperature. At room temperature and a pressure differential of 1 atmosphere flow rates along the bedding plane of Pittsburgh seam coal were helium 881 x 10-10 cm2sec-1, methane 1.2 X 10-10 cm2sec-1, ethane 0.54 X 10-10 cm2sec-1, n-butane 0.35 X 10-10 cm2sec-1, and toluene 3.8 X 10-10 cm2sec-1. Flow rates were 50 percent lower across the bedding plane of the coal than along the bedding plane. Activation energies were 3.9 Kcal mole-1 for helium and 13.6 Kcal mole-1 for methane, with diffusion measured either along or across the bedding plane.