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Termites also offer typical examples of the above mentioned type of svmbiosis. For a film of this subject it is advisable to gather information from the works of Jumelle and Perrier de la Bathe. « Termites champignonnistes et champignons des termitieres.de Madagascar » Dev. Gen. de Botanique 1910, and from the works of M. I. Petch. « The Fungi of certain Termite Nests » Ann. Roy Bot Gardens Paradenia 3, 1906. White Ants and Fungi : Ibid. 5, 1913.
Activities stimulating sprouting.
Preparations of mechanisms for placing Aesculus hippo castanum, Syringa vulgaris, Salix, Rhus, Corylus, etc.) under the warm bath, with ether, light, tobacco smoke, radio emanations.
The stimulated twigs should subsequently be shown while sprouting, and compared with others not as yet stimulated.
Examples of stimulation on organs in repose may be furnished by the sprouting of different seeds under the influence of light, of acids, etc.
Growth.
The cellular sections of a living plant may be shown from filaments of Spirogyra or other pericellular algae, grown in a small glass acquarium for placing under the microscope.
The meristematic tissues of higher plants may be projected as microscopic preparations, after having shown the arrangement of the various meristems in plants, in a picture of a botanical laboratory with demonstration from live plants by a technical expert. The projection of an auxanometer in function will give a precise idea of the growth of a plant and of the curve of this increase within a space of 24 hours. The influence of such external factors as temperature, light, humidity, on the growth may also easily be shown by the cinema.
Plants of oats, Lepidium sativum, Phaseolus, Tropaeolum, may be used with advantage for such experiments.
GEOTROPISM
Pictures of various species of plants under germination in conditions illustrating positive and negative geotropism, present no particular difficulties.
An interesting picture would be the negative geotropism of stubble straw. The stem of Cephalaria procera is also very suitable for the illustration of the negative geotropic curve.
The pressure exercised on mercury by the root apex of a germinating beech under the stimulus of gravitation may also be shown.