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— 8l2 —
The construction and functioning of the artificial osmotic Pfeiffer cell should then be shown.
The Plasmolysis will be produced on strips of living algae (Spyrogira or other large filamentous algae) by means of a hypertonic solution. The negative plasmolitic effect of an isotonic solution, and in conclusion the explosion of cells highly charged with osmotic pressure and immersed in water, grains of pollen, etc., will be shown.
After this practical examples of plasmometrics and some examples of the high pressure produced by vegetable tissues, turgescent and in pressure against various obstacles, may be given.
Properties of colloids.
Some of the chief organic colloids in the hydrosol stage, seen through the ultramicroscope. The Brown movement of particles or mi-and submicrobes, especially in sospensoidi liofobi.
The movement of one single particle may be projected by the slow motor projector in order to prominently illustrate the irregularity and complexity of the motion in a neutral, acid or alcaline medium. Phenomenon of precipitation, flocculation, coagulation. Ultramicroscopic views of inorganic
central cineteca of films concerning the combating of plant pathology. This initiative will unquestionably find great support in the constant and intense collaboration of the International Institute of Agriculture, which has given its valuable interest and the co-operation of its experts to this problem, in the comprehension of the problem shown by experts of all countries, and also in a possible resolution of the consultative organ created by the Institute of Agriculture and the B. I. T. with the participation of the competent international organisations.
This is an enormous work of propaganda, which we may be permitted to say only the cinema can achieve, because only the silver screen can show by illustrations, at once technical, practical and scientific, the vast and far reaching implications of that universal comprehension which must be made to filter through from the centres of research and bureaucracy to the world at large.
Producers are well aware zvith what enthusiasm, sustained interest and initiative the Institute is at their disposal for their, assistance in the spreading of their achievements in this field: we shall be glad to invite national associations and institutes to cooperate with suggestions and advice.
We consider ourselves merely a technical organ at every one's disposal, animated by the desire to find increasingly practical and efficient solutions of the problems which have been entrusted to us.