And after to-day's experiences I think he is right.

As he wanted to survey the whole country at a glimpse, so that the general scheme of defence might be put in hand, we had to have an aero big enough to take the party as well as fast enough to do it rapidly, and all at once.

We had, in addition to Rupert, my father, and myself, Sir Colin and Lord High Admiral Rooke (I do like to give that splendid old fellow his full title!).

The military and naval experts had with them scientific apparatus of various kinds, also cameras and range-finders, so that they could mark their maps as they required.

Rupert, of course, drove, and I acted as his assistant.