Electro-osmotic velocity, electro-osmotic pressure and rate of permeation for acetone/Pyrex sinters are reported in this paper. The range of validity of linear phenomenological relations has been experimentally ascertained. L12 is found to be constant up to potential differences of about 440 V. The second-order coefficient L112 has been estimated from measurements of electro-osmotic pressure and the rate of permeation in the presence of pressure and potential gradients. Streaming potential measurements are also recorded and L21 has been found to be constant up to pressure differences of 100 cm of acetone. Onsager's reciprocal relation has been verified.