Abstract
Defence requirements of a country have always been associated with its material resources and the manner in which case are put to practical use. In recent years this connection between defence and practical utilization of resources, or in other words, industrial development, has come to be more intimately appreciated and nations which are not in a position to meet some of their essential needs have harnessed science to make good the deficiencies by evolution of new processes, utilization of new raw materials and development of substitutes. Fixation of nitrogen to produce - ammonia and nitric acid is now a classic example of a process developed with the object of doing away with dependence on. imported Chile salt-petre, supplies of which were liable to be a t off in the event of war.
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