The cytochemical methods for lysozyme and nitroblue-tetrazolium reduction have been used to study the blast cells of acute myeloid leukaemia. Both proved useful in characterizing the cases with predominant monocytic differentiation. THE DEMONSTRATION OF LYSOZYME ACTIVITY HELPED TO DEFINE TWO MAIN GROUPS: (a) with predominantly lysozyme-negative cells (myeloblastic-promyelocytic), and (b) with c...

The use of a solid reagent in the triphenyl tetrazolium chloride (T.T.C.) test for significant bacteriuria is described. The reagent gave a positive result with 108 (86%) of 126 specimens of urine containing over 100,000 organisms per ml. In comparison with the standard T.T.C. test the modified test gave comparable results. Some possible reasons for the varying results obtained by different use...