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The Cell, Cell Organs, The Nucleus, Mitochondria and Golgi Apparatus, Cell Division, The centrosomes, spindle and Asters, The maturation of the Germ-cells; spermatogenesis, The Maturation of the Germ-cells (continued) The Maturation of the Egg and the Nature of the Meiotic phase, The cytoplasmic structures in spermatogenesis and Oogenesis, Fertilisation and segmentation, Parthenogenesis, Artificial Parthenogenesis, The cytological basis of Sex-Determination, Germ-cell Determinants, The Theory of the Individuality of the Chromosomes, The mechanism of Hereditary Transmission, The role of the Cytoplasm in development and heredity,