. The biology of the protozoa. Protozoa; Protozoa. THE FUNDAMENTAL ORGANIZATION 59 despite the fact that very little definite information is at hand con- cerning it. In pure form it is the nucleolus of tissue cells and stains intensely with acid dyes. Such nucleoli are rare in Protozoa, but the combination of plastin with chromatin in some degree is char- acteristic of Protozoa, and the staining reaction with basic or acidic dyes varies with the preponderance of one or the other. The ground-substance of the nucleus or karyolymph (Lundegardh) is difficult to define, a difficulty which Belar (19
. The biology of the protozoa. Protozoa; Protozoa. THE FUNDAMENTAL ORGANIZATION 59 despite the fact that very little definite information is at hand con- cerning it. In pure form it is the nucleolus of tissue cells and stains intensely with acid dyes. Such nucleoli are rare in Protozoa, but the combination of plastin with chromatin in some degree is char- acteristic of Protozoa, and the staining reaction with basic or acidic dyes varies with the preponderance of one or the other. The ground-substance of the nucleus or karyolymph (Lundegardh) is difficult to define, a difficulty which Belar (1926) recognizes by the statement: ". . at best it can be defined as that part of the nuclear space which is neither chromatin nor plastin" (loc. cit., p. 242). From this negative definition and from the fact that it cannot be demonstrated by specific staining reactions or character- ized by definite structures, it might seem that karyolymph is a negligible part of the nuclear make-up. Such a conclusion, how- ever, would be a mistake for some of the most important structures of the active nucleus take their origin from this ground substance (see pp. 88, 200).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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