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A marked increase in reticular argyrophilia may be obtained in the Foot ammoniated silver carbonate technic by interposing a strong periodic acid oxidation, 4y0 aqueous for 2 hours at 25-27" C., prior to silvering. Sections so oxidized before the silver bath show a histological picture of connective tissue that is stronger than that given b y the original technic. Stroma of lymphoid tissues (but not other types) is further intensified by brief (5-10 sec.) pas-

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