At first, everything culminated in the word “North”; but almost immediately the whirling traffic on the south going rails had to be considered also, as it grew in volume. How he managed it, I do not know; but he seemed to have some sub-conscious faculty of drawing a balance-sheet of the traffic at any moment; so that he knew if he was sending too much North or too little South. Personally, I imagine that he owed his success to a power akin to that of the professional chess-player who can play a dozen blindfold games at one time. Everybody has the faculty of mental visualisation developed in a greater or less degree; but in Grogan, as far as traffic was concerned, it seems to have attained supernormal proportions. I believe that he actually “saw” in his mind the whole of England covered with his trains and motor fleets and that he had by some means established time-scales which enabled him to calculate the moments at which any train or fleet would pass a series of given points. It was, of course, an immensely more difficult affair than blindfold chess-playing; but I think it clearly depended upon cognate processes. Congleton, the Shipping Director, had a much easier task. For him there was no trouble of blocked rails or interleaving traffic. His main difficulty arose from berthing accommodation, which was a comparatively simple affair. Most of the food-supplies were transferred North on board ship; and a certain amount of the shifting of population was also done in this way, especially the removal of the Glasgow inhabitants. I can only give the merest outline of these great operations; for the details are too intricate to be described here. Nordenholt’s first step was to commandeer most of the public halls in the country, which were then fitted up with partitions, etc., in order to convert them into temporary dwelling-places for families. Thereafter, he began to move his Nitrogen Volunteers into the Clyde Valley step by step; and simultaneously, under the Billeting Act, he evicted the local population to make room for his men. There was a considerable outcry; and at times the military had to be employed to persuade the reluctant to move out of their homes; but after the first few cases of obstruction had been dealt with firmly, the people recognised that it was useless to protest. Edinburgh was also treated in the same way; for Nordenholt had planned to occupy a belt of country running from coast to coast. He had to find room for a population of five millions; and it was evidently going to be a difficult matter.