A second characteristic which is shared by all ego-maniacs is their incapacity to adapt themselves to the conditions in which they live, whether they assert their anti-social inclinations in thought or action, in writings or as criminals. This want of adaptability is one of the most striking peculiarities of the degenerate, and it is to them a source of constant suffering, and finally of ruin. It is a necessary result, however, of the constitution of his central nervous system. The indispensable premise of adaptation is the having an exact presentation of the facts to which a man must adapt himself.[250] I cannot avoid the ruts in the road if I do not see them; I cannot ward off the blow I do not see coming; it is impossible to thread a needle if its eye is not seen with sufficient clearness, and if the thread is not carried with steady hand to the right spot. All this is so elementary it is scarcely necessary to say it. What we term power over Nature is, in fact, adaptation to Nature. It is an inexact expression to say we make the forces of Nature subject to us. In reality we observe them, we learn to know their peculiarities, and we manage so that the tendencies of natural forces and our own desires coincide. We construct a wheel at the point where the water power, by natural law, must fall, and we have then the advantage that the wheel turns according to our needs. We know that electricity flows along copper wire, and so, with cunning submission to its peculiar ways, we lay down copper lines to the place where we want it, and where its action would be useful to us. Without knowledge of Nature, therefore, no adaptation, and without adaptation no possibility of profiting by its forces. Now, the degenerate subject cannot adapt himself, because he has no clear idea of the circumstances to which he ought to adapt himself, and he does not obtain from them any clear idea, because, as we know, he has bad nerve-conductors, obtuse centres of perception, and feeble attention.