When they have been solved, then the day of the comparatively cumbersome Tank, with its dependence upon shipping and rail transport will be over. But that will not be in our time we are assured. To us, therefore, “War in the Air” remains of a somewhat academic interest. We have got to see to it that we survive the present. For can the most optimistic of us truthfully declare, as he casts his eye over the world, as he looks from Middle Europe to the Far East, from Russia to Mexico, from the Balkans to Egypt, or from Asia Minor to the confines of India, that we need not even consider the possibility of a war within his own generation? Alas, no! Now having for the moment dismissed the purely air war from our calculations, we can be pretty certain that a war between civilised countries fought within that period would not differ utterly from the war which is just over, and that a war between a civilised and an uncivilised country would differ from it only along well-known lines. We have heard a good deal of evidence which makes it appear certain that, every other factor having cancelled out, the fact that the French and British possessed Tanks and the Germans did not, was just enough to win the last war for the Allies. Let us then sedulously cultivate the grub of the present that we may survive to see the more glorious butterfly of the future--perhaps the aerial Tank. Shall we neglect the Tank because it seems likely that in this (as please Heaven in most other affairs) our sons will go one better? The British and French led, and in 1919 still lead, absolutely with Tanks. If we like to carry on, we have such a start both in design and manufacturing experience, that we could easily make it impossible for any other nation to draw abreast of us during the period after which we are assuming the “Tank Age” in military evolution may conceivably be over. It is, of course, impossible to be too discreet as to the new machines which have already been made and tested, or as to the new projects which exist. Perhaps the position can be best indicated by saying that progress has been so rapid of late that those who know, would probably be delighted to sell any number of Mark V. Tanks to a prospective enemy. III