Methods and equipment for the separation of the formed elements of the blood are outlined and discussed. Selection of any given method should be predicated on the purposes for which the isolated cells are to be used. The technics vary from simple fractional sedimentation requiring no equipment (when viable cells are not necessary) to complex, refrigerated, centrifuge equipment when cells in their true state in nature are desired. An apparatus for the rapid separation of blood in a continuous, closed-system is described and discussed.

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