Some are concerned simply with planning the logistics of future wars; others devise larger and larger rocket bombs, more and more powerful explosives, and more and more impenetrable armour-plating; others search for new and deadlier gases, or for soluble poisons capable of being produced in such quantities as to destroy the vegetation of whole continents, or for breeds of disease germs immunized against all possible antibodies; others strive to produce a vehicle that shall bore its way under the soil like a submarine under the water, or an aeroplane as independent of its base as a sailing-ship; others explore even remoter possibilities such as focusing the suns rays through lenses suspended thousands of kilometres away in space, or producing artificial earthquakes and tidal waves by tapping the heat at the earths centre. Alison Eastwood Sex. Flory was too astonished to ask any questions.