1. The whole contents of the body cell of Ginkgo is transformed into two spermatozoids. Between the two spermatozoids there is no cell wall when they are formed, however they are surrounded by a common wall.
2. So long as the spermatozoids are still enclosed in the mother cell the cytoplasmic sheath of the spiral band takes an a compressed form.
3. The swimming spermatozoid has an expanded spiral band, which is distinctly broadest in width at the apical end and gradually decreases finaily fading out entirely.
4. Several methods by which the spermatozoids get out of the polten tube in sugar solutions are described.
5. The Body of the spermatozoid is soft and elastic, so that as a result of a slight pressure it may change its form, but it recovers its shape again after the Pressure is removed.
6. The cytoplasmic sheath of the spiral band only may be of a comparatively solid nature, whereas the remaining parts of the body, which are surrounded by the plasma membrane are of a highly liquid nature.
7. The entire spermatozoid is found in the receptive cavity. This fast proves that the spermatozoid passes without injury through the narrow opening or canal between the neck cells.
8. The male nucleus slips out of its cytoplasmic sheath, then travels an alone and fuses with the egg nucleus, while the cilia bearing cytoplasmic sheath is left near the boundary of the egg cytoplasm.