Apparatus for embedding tissue samples

A system for providing an embedded tissue specimen subsequent to fluid treatment preparatory to histological examination comprising the combination of a rectangular cassette having four side walls and a bottom wall for use in the preparation of tissue specimens for histological examination and an embedding mold having a first cavity for receiving the treated specimen and a second cavity having four side walls for receiving said cassette, said cassette having a plurality of slots in each of said four side walls and a plurality of apertures in said bottom wall, said slots having a width sufficiently narrow to cause capillary pumping of molten wax when a predetermined amount of molten wax is dispersed into said embedding mold, said embedding mold having a depressed section in one of the side walls of said second cavity, said depressed section serving as a weir to provide an overflow of an excess of said molten wax to provide said predetermined amount of said molten wax.