International Review of Educational Cinematography (Jan-Dec 1931)

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— 820 — The chemotropism of the pollinic tube. Repetition of the experiments of Lidforss and Miyoshi. Chemotropism of roots. Repetition of the experiments of Porodko. Tigmotropism and Phototropism. A branch of Bryonia dioeca in various stages of its twining round a cord or reed. Repetition of some of the experiments of Pfeiffer and Filling. Chemotasis. The phenomenon of bacteria. Repetition of the Pfeiffer experiments. In mixomycetes and lower speciments of fungi (zoospores) : in the sperm•atozoids of Lerns (Pfeiffer experiments). APPLIED GENETICS Hybridation. — The technique of the removal of the stamens of flowers, or other expedients to impede self pollination. Methods of collecting, preserving and distributing pollen on the stigma. Methods of preventing the pollination of the stigma previous to, and immediately after the artificial pollination. The gathering of fruit and seeds obtained by hybrid fecundation. The sowing and training of plants deriving from hybrid seeds. The character of the first generation (F.) a mono-hybrid, as compared with the characteristics of the two parent plants. The character of the second generation (F 2) as compared with F, and the parents (P). The theoretical explanation of the results obtained. This explanation can only be given by means of schematic, coloured sliding designs, representing the sex cells of the two hybrid plants, and of the product of their fusion, with the differing characteristics well defined. These designs should, of course, show the characteristics both in their latent state, in the hereditary substance and in their manifestation. Schedules used in genetic treatises are often formed of disks made of two concentric zones, the outer zone representing the manifest character, and the inner zone the germinating plasma with the characteristics of the two sorts of sexual cells. Less arid and concise schedules may be procured by adding drawings, however summary, of the plants to which they refer. MICROBIOLOGY A view of a laboratory equipped for the research of protistology, bacteriology and micrology. Projections of living growths of protozoids (ciliate, flagellates, amoebae)