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also seen through the high power microscope. Projections of liquid cultures or mobile or immobile bacteria, spore forming and non spore forming, of individual growths isolated or united in filaments and zooglooae. Projections of fungus with small and big enlargements. Some sporigenous organs. Zoosporanges dehiscing Avith the emptying of the zoospores. Oogones and antherides : peritecidcs, apothecides, picnides, collides.
The fructifying body of an agaric and of a polyporous fungus, and their relations to the mycelia. Section of a lamella with a tube to show the hymen.
The technique of the artificial culture of micro-organisms. How to cultivate protozooids (mixed culture of ciliates and bacteria) the pure culture of flagellates, algae, bacteria of fungi. Methods of isolation. Cultures for anaerobes. The germination of spores. Budding. Dissemination of spores in some fungi. (Cinematographabie examples will be found quoted in A. H. R. Buller's Research on Fungi).
Nitrogen fixing Bacteria. — A view of a natural wood, showing the vigorous development of the trees and undergrowth. A demonstration of the quantity of wood formed each year in a hectar of forest, and consequently the quantity of nitrogen of which the soil is annually depleted, if not replenished by fertilisers.
The nitrogen fixing micro-organisms. Colture of Clostridium pasieurianum (Winogradsky method). Projection of preparations with vegetable cells of Clostridium, of sporigenous cells of germinating spores. Process of cultures by the Winogradsky method. The necessity of neutralising the butiric acid to reactivate the fermentation : the development of fungi and algae in the cultures made possible by the presence of nitrogen.
Protection of the Clostrium against oxygen in the soil (Symbiont bacteria of the Clostridium living in the zooglocae of the latter).
Aztobacter Cultures. — Isolated aztobacter in liquid cultuies. (Aztobacter agiles). How to discover the presence of Aztobacter in a specified piece of ground. Pictures of the various operations : Removal of the soil, separation of the fine soil deprived of plant waste. Weighing of 50 grams plus gr. 0,5 of mannite. The earth, thus prepared is poured into a Petri dish in a layer about one centimetre thick. The Petri dish is transported in a thermostat. Successive microscopic samples, illustrating the development of the Aztobacter.
Projections of diagrams, curves, etc., illustrating the amount of nitrogen fixed in iron compounds. (Rosing and Remy) Kaserers experiments in support of the latter interpretation.
The influence of compounds of potassium and phosphor on the assimilating activities of the nitrogen in the Aztobacter. Influence of the concentration of ions of hydrogen in the ground. These different influences may be shown by pictures of cultures in which in many cases the activities of the fixation