view into the future can reach. It is, indeed, obvious that our view can never reach far enough for us to be certain that any action will produce the best possible effects. We must be content, if the greatest possible balance of good seems to be produced within a limited period. But it is important to notice that the whole series of effects within a period of considerable length is actually taken account of in our common judgments that an action is good as a means; and that hence this additional complication, which makes ethical generalisations so far more difficult to establish than scientific laws, is one which is involved in actual ethical discussions, and is of practical importance. The commonest rules of conduct involve such considerations as the balancing of future bad health against immediate gains; and even if we can never settle with any certainty how we shall secure the greatest possible total of good, we try at least to assure ourselves that probable future evils will not be greater than the immediate good. =17.= There are, then, judgments which state that certain kinds of things have good effects; and such judgments, for the reasons just given, have the important characteristics (1) that they are unlikely to be true, if they state that the kind of thing in question _always_ has good effects, and (2) that, even if they only state that it _generally_ has good effects, many of them will only be true of certain periods in the world’s history. On the other hand there are judgments which state that certain kinds of things are themselves good; and these differ from the last in that, if true at all, they are all of them universally true. It is, therefore, extremely important to distinguish these two kinds of possible judgments. Both may be expressed in the same language: in both cases we commonly say ‘Such and such a thing is good.’ But in the one case ‘good’ will mean ‘good as means,’ _i.e._ merely that the thing is a means to good--will have good effects: in the other case it will mean ‘good as end’--we shall be judging that the thing itself has the property which, in the first case, we asserted only to belong to its effects. It is plain that these are very different assertions to make about a thing; it is plain that either or both of them may be made, both truly and falsely, about all manner of things; and it is certain that unless we are clear as to which of the two we mean to assert, we shall have a very poor chance of deciding rightly whether our assertion is true or false. It is precisely this clearness as to the meaning of the question asked which has hitherto been almost entirely lacking in ethical speculation. Ethics has always been predominantly concerned with the investigation of a limited class of actions. With regard to these we may ask _both_ how far they are good in themselves _and_ how far they have a general tendency to produce good results. And the arguments brought forward in ethical