A new epoxy embedding mixture for biological material recently has been introduced by Freeman and Spurlock (1). This mixture consists of Mara-glas 655, Cardolite NC-513, dibutyl phthalate, and the curing agent benzyldimethylamine (BDMA). Maraglas has certain advantages over other resins and epoxies, notably, wide range of miscibility, low viscosity, ease of sectioning, good staining qualities, ...