Abstract
Heidenhain''s hematoxylin, according to the following formula, may be used for studying chromosomes in temporary smears of pollen mother cells: 1 part 0.5% hematoxylin and 4% iron alum (equal parts of each); 1 part 95% alcohol; and 2 parts glacial acetic acid.-Author (courtesy Wistar Bibl, Serv.).

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