Plaster of Paris (CaSO, 'hH?O) infiltration was used (i) to study the continuity ofcracks and pores and the variation of macroporosity and crack width with depth and (ii) to maintain an undisturbed seedbed for subsequent resin impregnation. Examples are also given in which the remains of gaps between and at the bottom ofthe furrow slice can be clearly seen. The method is a useful qualitative visual technique, limited to the larger soil pores. Due to this limitation, it is more useful for showing pore continuity than for quanli@ing porosity.

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