[97] _Mankind in the Making_, p. 406. But now that we can no longer use the range of our senses as a basis for calculating the possible area of the civilised State, there might seem to be no facts at all which can be used for such a calculation. How can we fix the limits of effective intercommunication by steam or electricity, or the area which can be covered by such political expedients as representation and federalism? When Aristotle wished to illustrate the relation of the size of the State to the powers of its citizens he compared it to a ship, which, he said, must not be too large to be handled by the muscles of actual men. 'A ship of two furlongs length would not be a ship at all.'[98] But the _Lusitania_ is already not very far from a furlong and a half in length, and no one can even guess what is the upward limit of size which the ship-builders of a generation hence will have reached. If once we assume that a State may be larger than the field of vision of a single man, then the merely mechanical difficulty of bringing the whole earth under a government as effective as that of the United States or the British Empire has already been overcome. If such a government is impossible, its impossibility must be due to the limits not of our senses and muscles but of our powers of imagination and sympathy. [98] Aristotle, _Polit._, Bk. VII. ch. iv. I have already pointed out[99] that the modern State must exist for the thoughts and feelings of its citizens, not as a fact of direct observation but as an entity of the mind, a symbol, a personification, or an abstraction. The possible area of the State will depend, therefore, mainly on the facts which limit our creation and use of such entities. Fifty years ago the statesmen who were reconstructing Europe on the basis of nationality thought that they had found the relevant facts in the causes which limit the physical and mental homogeneity of nations. A State, they thought, if it is to be effectively governed, must be a homogeneous 'nation,' because no citizen can imagine his State or make it the object of his political affection unless he believes in the existence of a national type to which the individual inhabitants of the State are assimilated; and he cannot continue to believe in the existence of such a type unless in fact his fellow-citizens are like each other and like himself in certain important respects. Bismarck deliberately limited the area of his intended German Empire by a quantitative calculation as to the possibility of assimilating other Germans to the Prussian type. He always opposed the inclusion of Austria, and for a long time the inclusion of Bavaria, on the ground that while the Prussian type was strong enough to assimilate the Saxons and Hanoverians to itself, it would fail to assimilate Austrians and Bavarians. He said, for instance, in 1866: 'We cannot use these Ultramontanes, and we must not swallow more than we can digest.'[100]