hereinbelow the apertures are provided for the purpose of passing fluid through the cassette at a direction both parallel and orthogonal to the bottom wall 17 as described in the 39 869 mccormick patent an embedding mold 31 is also shown in fig1 the embedding mold 31 has a well 33 for reception of specimen samples after they are processed in the cassette 11 the embedding mold 31 has a front wall 35 a back wall 37 and side walls 39 the back wall 37 and side walls 39 have inner surfaces which generally conform to the outer surface of the back wall and side walls of the cassette 11 the bottom wall 41 of the embedding mold 31 is flat to conform to the flat surface of the bottom wall of the cassette 11 the embedding mold may also be provided with gripping tabs 43 to aid in manipulating the embedding mold support runners 45 are provided to stabilize the embedding mold 31 during various embedding operations a depressed section 47 of the back wall 37 provides a weir for overflow of molten wax to provide one means for establishing a predetermined amount of molten wax in embedding mold 31 other means for providing a predetermined amount of molten wax in the embedding mold 31 include the use of a metering pump and use of premeasured aliquots of wax fig2 shows the cassette 11 in operating position within embedding mold 31 prior art embedding operations are illustrated in fig4 a 4g a treated specimen 49 is provided.