In Vitro: Jenner's Stain (10%) is used for the strain of wheat-rye hybrids e to obtain bands simultaneously on both the rye and the wheat B genome and 4A chromosomes. In malarial blood the pigmented bodies of tertian fever and the crescent bodies of mstivo-autumnal fever are readily demonstrated with Jenner's stain. With Jenner's stain, the nuclei of all the forms are stained a light blue and the cytoplasm a light pink. With Jenner's stain, flooded with the stain for about three minutes and then washed by gentle agifation in a dish of distilled water until the specimen has attained a pink hue.