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Abstract
A procedure is described which enables a stain to be definitely located in the substance of the nucleolus. Material is fixed in either Navashin or Levitsky; the chromatin is stained by means of the improved Feulgen technic introduced by de Tomasi, and preparations brought thru the washing solutions down to distilled water. From distilled water the material is transferred to a mordant solution, 5% sodium carbonate in water, in which it is left for at least one hour. After mordanting wash well with water then stain for ten minutes in light green solution (90% alcohol, 100 cc, light green SFY, 0.5 g, aniline oil, 2 drops, well shaken); differentiate in alcoholic sodium carbonate solution, (70% alcohol saturated with carbonate); treat with 95% alcohol, absolute alcohol, equal parts xylene and absolute alcohol, clear in pure dry xylene and mount in neutral balsam. Cytoplasm and karyolymph should be quite clear, with magenta chromatin and well defined green nucleoli. The light green does not behave like a simple counterstain as in previous technics but as a definite stain for nucleolar material.