I. Introduction -- II. Material and Methods -- Sulphide Treatment, Sectioning and Postfixation -- Staining of Sections (โ{128}{156}Physical Developmentโ{128}{157}) -- Preparation of Paraffin Material -- Photography of Sections -- III.Observations -- A.Temporal Course of the Development -- B.General Distribution of the Stain in Grey and White Matter -- B.Regional Staining Patterns -- IV.Discussion -- A.The Sulphide Silver Method -- B.Variations in the Results -- C.Chemical Interpretation of the Staining -- D.The Cellular Localization of the Stain -- E.Timm Staining of Paraffin Sections -- F.Concluding Remarks -- V.Summary and Conclusions -- Acknowledgements -- References