well-known theory of eudæmonism, but it is founded on a biological, not a metaphysical, basis. It explains optimism and pessimism simply as an adequate or inadequate vitality, as the existence or absence of adaptability, as health or illness. Unprejudiced observation of life shows that the whole of mankind stands knowingly or unknowingly at the same philosophical standpoint. Men live willingly, and rather quietly happy than sadly, so long as existence affords them gratification. If the sufferings are stronger than the feeling of pleasure conferred by the satisfaction of the first and most important of all organic impulses--the impulse of life or self-preservation--then they do not hesitate to kill themselves. When Prince Bismarck once said, ‘I do not know why I should bear all the troubles of life, if I were not able to believe in a God and a future life,’ it only shows that he is insufficiently acquainted with the progress of human thought since Hamlet, who raised somewhat the same question. He bears the troubles of life because, and as long as, he can bear them, and he throws them down infallibly at the moment in which his strength is no longer adequate to carry them. The unbeliever lives and is happy, so long as the sweets of life weigh down the scale, and for this reason also the believer, as experience daily teaches, will commit suicide if he sees his balance of life’s account yielding a deficit of satisfaction. The arguments of religion have undoubtedly in the mind of the believer, as have the arguments of duty and honour in the mind of the unbeliever, a convincing force, and must likewise be taken into account as so many assets. Nevertheless they have only a limited, if high value, and can counterbalance their own equivalent of suffering only, and no more. From these considerations it follows that the terrible question--‘Wherefore am I alive?’--which nearly drove Tolstoi to suicide, is to be answered satisfactorily and without difficulty. The believer, who accepts the fact that his life must have an aim, will live according to his inclinations and powers, and tell himself that he performs correctly, in this way, his allotted portion of the world’s work without knowing its final aim; as also a soldier, at that point of the field of battle where he is placed, does his duty willingly, without having any notion of the general progress of the fight, and of its significance for the whole campaign. The unbeliever, who is convinced that his life is a particular instance of the universal life of Nature, that his individuality has blossomed into existence as a necessary law-governed operation of eternal organic forces, knows also very well not only ‘wherefore,’ but also ‘what for,’ he is alive; he lives because, and as long as, life is to him a source of gratification--that is to say, of joy and happiness.