“…Variations in nucleolus^ultrastructure during mitosis include the dispersion of the nucleoli into smaller masses (Brinkley, 1965), the disintegration into surrounding nucleo plasm (Ohouinard, 1966;Lafontaine, 1968;and Lafontaine and Ohouinard, 1963), the loosening of the components with a loss of the granular areas and persistance of the fibrillar areas (Hsu, £t 1965;and Underbrink, et 1967a), and the loosening of the granular zone accompanied by the loss of the fibrillar regions (Allen and Bowen, 1966). (1968a) followed the general position and shape of the nucleolus in Lilium longlflorum meiotic prophase.…”