By MARCEL BEsSIS T HE STUDY OF BLOOD CELLS by classic-al Isist.ological and hematological technics does usot seem likely to utsdcrgo munch furthser development, ansd for this reasots a special inst.erest in new methods of imsvestigations, including cytochemistry, electron microscopy, and phase contrast microscopy has developed svit.hius recetit years. We shall try to summarize the resunlts obta...