WHITE BLOOD CELLS
Chemical Observations on Leucocytes.
—Rottino makes a pertinent suggestion: "A fruitful field for research would be one which still lies on the frontiers of the unknown—namely the physiology of the lymphoid system." 699 This is equally applicable to the physiology of the other white cells. Too long has our research been dominated by the empiric approach.Microspectrophotometric estimation of the deoxyribonucleic acid (DNA) content of individual normal human lymphocytes discloses that such cells contain twice the average DNA content of normal human spermatids.700 Nucleic acid content of splenic lymphocytes has been studied in mice.701 A report concerning stable sudanophilia of human neutrophile leucocytes in relation to peroxidase and oxidase concludes that the sudanophilia of leucocytes is as yet unexplained.702 Other extensive cytochemical studies have been made by Storti and co-workers.*Carbohydrate metabolism of leucocytes has been comprehensively reviewed.703 Studies