Book excerpt: Section I Ultrastructure and Fragmentation of Neural Tissue.- 1 Bulk Separation of Neuronal Cell Bodies and Glial Cells in the Absence of Added Digestive Enzymes.- I. Introduction.- II. Bulk Isolation Procedures Requiring No Added Digestive Enzyme(s).- A. The Procedure Developed in the Authors' Laboratory.- B. The Procedure of Nagata et al. (1971).- C. The Procedure of Iqbal and Tellez-Nagel (1972).- D. The Procedure of Jones et al. (1971).- III. General Procedural Comments.- IV. Cell Yield and Biochemical Characterization.- V. Applications in Cellular Neurochemistry.- A. Centrifugal Fractiona.