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abnormally coloured blossoms (blue or mauve). The technique used for the administration of the above mentioned salts should be the same as that indicated by Molisch in his treaty « Physiology of Plants as a GardeningTheory », page 14.
Action of enzymes.
The process of corrosion of starch grains produced by amilasis may be taken under the microscope in its various stages as also of the lamella of the cellular walls of a vegetable parenchyma under the action of pectinase.
The action of the protelithic enzymes may also be shown by projecting the gradual process of dissolution under the influence of protease egg albumen, previously coagulated. The coagulation of milk as a result of curds (Chimosina), is also suitable for filming. Also the action of oxidase might form an instructive part of this film.
Lacase and tyrosinase effect rapid and notable changes of colour in certain substances.
Lipase might also furnish filming matter because the decomposition of fats may apply to certain vegetable tissues such as the epidermis, always covered by a more or less developed cuticle composed of wax substances. Many fungi that attack the cuticle such as Cyclonoium oleaginum, secernonolipasi.
SYMBIOSIS
Examples of symbiosis in higher plants and fungi may be furnished abundantly by plants containing mycorrhiza.
Of these various forms of ectotrophic and endotrophic, projecting the mycorrhiza, separate and adhering to all the rest of the root system, with different coloured sections, in order to show the relationship between the fungus and its root tissues.
Orchids, and more especially Cypripedium or Cattleya. First the grown plant in blossom, and then the microtrophic roots, from without and within may be shown. The operation of the isolation of the fungine symbiont, and its culture on a nutritive artificial groundwork, should be taken. Subsequently the operation of the artificial synthesis of the symbiosis in the pure orchid culture.
Projection of the embryon with incipient infection. Projection of cultures of orchid seeds on a nutritive groundwork appropriate for obtaining the germination and development of the plants in the absence of fungus.
The symbiosis between nitrogen fixing bacteria and roots of leguminous plants may offer excellent filming material. First pictures of leguminous, herbaceous and ligneous plants with root tubercles will be projected, followed by sections of some tubercles with weak and strong enlargements.