Sections from 3 μ to over 100 μ thick of fresh, unfixed, unembedded, unde-calcified and undehydrated bone are made by grinding 1 to 2 mm slabs of the desired orientation on waterproof carborundum abrasive paper, grit No. 320, 360 or 400. The manner of controlling the section is the crux of the technique. The section is held by wrapping a fresh strip of sandpaper around a 3" × 1" slide and accomplishing the grinding on a used piece of paper. The abrasive points on the fresh paper effectively prevent the section from sliding off the slide. The specimen is kept wet with water during the entire procedure. Sections are then stained, and excess surface stain can be ground off in similar fashion. After washing in dilute detergent solution to remove adherent derbis, the section is air dried and mounted in any nonacidifying resinous media. The method is suitable for wood and for fruit pits also.