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illuminated by various radiations of the spectroscope. Experiment, showing that live leaves can behave like photograph paper, sensitive to light, and can therefore reproduce the development of positive figures impressed against a negative (a development based on the Sachs formation of amyloiodide) in the green parts exposed to the light.
Circulation of Assimilation Products.
Projection of longitudinal sections of leaf veins, of twigs, of stems, showing the phloematic tissue in its various elements.
Effects of anular incision (in the Evonymous japonicus) or of binding (in the Syringa vulgaris) the operations of incision and binding, and subsequently the various stages of swelling above the incision or the binding, the development of roots etc., should be shown. Effects on fructification.
Mineral nutrition of Higher Plants.
This subject is less suitable for the cinema than for slides. The various stages of development of plants of one and the same family, vegetating in nutritive solutions of various composition may, however, be filmed : among the latter, besides those that are complete, there are others that lack the necessary elements.
The film may begin with the technique of preparation of the liquid cultures and close by showing experiments made on the spot under the influence of various fertilising minerals.
It would also be very instructive to show the comparative development of plants with special trophic requirements in maximum favourable conditions of mineral nutrition, compared to conditions in which an essential mineral element was lacking.
Thus for instance the minimum development of germinating beech striplings (phaseolus multiflorus), growing in a nutritive solution deprived of chalk, compared to those in a complete solution, might be shown.
The pernicious effect of chalk on strictly silicicole plants, such as the Calluna vulgaris and Sphagnum, may be shown.
Similar experiments may be shown with reference to potassium and plants, as for instance, in beetroot, that suffers considerably if cultivated in a solution deprived of, or deficient in that element. The absolute lack of iron, and consequent chlorosis might also be made the subject of a short coloured moving picture. A film, showing the influence that certain chemical salts may have on the colour of hydrangea flowers, would be particularly interesting.
Alum [Al2 (S04)3 K2 SO„ — 24 H20], sulphate of aluminium, sulphate of iron. The colour film might, of course, show the hydrangea flowers in their normal colours, the technique of chemical manuring, and finally the