expense for the transportation of the rotten goods. This example illustrates the relation between the quantities of pleasure and of pain which are caused by a given instinct. I determine the value of the good apples, not by subtracting the sum of the good from that of the bad ones, but by the fact that, in spite of the presence of the bad ones, I still attach a value to the good ones. Just as I leave out of account the bad apples in the enjoyment of the good ones, so I surrender myself to the satisfaction of a desire after having shaken off the inevitable pains. Supposing even Pessimism were in the right with its assertion that the world contains more pain than pleasure, it would nevertheless have no influence upon the will, for living beings would still strive after such pleasure as remains. The empirical proof that pain overbalances pleasure is indeed effective for showing up the futility of that school of philosophy, which looks for the value of life in a surplus of pleasure (Eudæmonism), but not for exhibiting the will, as such, as irrational. For the will is not set upon a surplus of pleasure, but on whatever quantity of pleasure remains after subtracting the pain. This remaining pleasure still appears always as an object worth pursuing. An attempt has been made to refute Pessimism by asserting that it is impossible to determine by calculation the surplus of pleasure or of pain in the world. The possibility of every calculation depends on our being able to compare the things to be calculated in respect of their quantity. Every pain and every pleasure has a definite quantity (intensity and duration). Further, we can compare pleasurable feelings of different kinds one with another, at least approximately, with regard to their intensity. We know whether we derive more pleasure from a good cigar or from a good joke. No objection can be raised against the comparability of different pleasures and pains in respect of their intensity. The thinker who sets himself the task of determining the surplus of pleasure or pain in the world, starts from presuppositions which are undeniably legitimate. It is possible to maintain that the Pessimistic results are false, but it is not possible to doubt that quantities of pleasure and pain can be scientifically estimated, and that the surplus of the one or the other can thereby be determined. It is incorrect, however, to assert that from this calculation any conclusions can be drawn for the human will. The cases in which we really make the value of our activity dependent on whether pleasure or pain shows a surplus, are those in which the objects towards which our activity is directed are indifferent to us. If it is a question whether, after the day's work, I am to amuse myself by a game or by light conversation, and if I am totally indifferent what I do so long as it amuses me, then I simply ask myself: What gives me the greatest surplus of pleasure? And