A method of concentrating particles of bone marrow for paraffin sections.

Received Jiimiary 12, 1959; revision received March 6; accepted for publication March 23. Dr. Zbar is Assistant Chief of Laboratory Service, Veterans Administration Hospital, and Instructor in Pathology a t the University of Miami School of Medicine. Dr. Winter is Associate Professor of Pathology at the University. detail by fixation and processing, with attendant problems in interpretation. Methods previously described in the literature are cumbersome to perform. 2 For the past several years, we have utilized to great advantage a simple method for processing material obtained by aspiration of the marrow cavity. This procedure consistently produces a good yield of