SPODOGRAMMA (Greek spodos ashes, ashes + gramma of the devil, the image) — the tissue specimen received by influence of high temperature under strictly certain conditions on the cut of a pla spread on a slide plate a pellicle of fabric. On distribution and structure of ash particles to S. judge degree mineralizations (see) fabrics, quantity and qualitative structure of its inorganic components, and also about topography of mineral salts in fabric.
S.'s studying under a microscope in a dark field, in the slanting transmitted light reflected pl allows to distinguish the particles containing silicon (white color), iron (from yellow till red color), to mark zones of accumulation of ashes. In a direct transmitted light, especially in polarized, nek-ry crystals of silicon compounds differ in double refraction, compounds of calcium — strong light refraction, accumulations of not burned out carbon — black color. For carrying out microchemical reactions or S.'s solubility tests cover with the thin coat of a collodion interfering the shift of ash particles and make reactions to lime (see. Kossa ways ), iron (see), etc. Silicon compound and calcium distinguish on S. on their inability to be dissolved in water. After carrying out reactions of S. it is possible to dehydrate and conclude in balm, having received thus permanent preparation.
See also Microincineration .
Bibliography: Lille R. Patogistologicheskaya of the technician and a practical histochemistry, the lane with English, page 600, M., 1969.
Ya. E. Hesinonim