Every natural scientist, I should suppose, is an empiricist. But to say this is not to assert that he is consciously such. Very few scientists would presumably consider themselves qualified to state even what is involved in the term, and still fewer would be willing to admit that they are adherents of the position. One might say that natural scientists, in their general outlook, presuppose—in one of the many meanings of this term—the empirical point of view. This probably means that if one could make clear to them what is meant by the term, and if one could convince them that it is proper for scientists to take sides on philosophical issues, they should probably be willing to call themselves empiricists. Expressed otherwise, the general temper and spirit of natural science are those which philosophers tend to identify with the empirical outlook.