or along time the definitions were supposed to be made not in terms of relations but through certain properties of antecedent things. The space, time and motion of physics were treated as inherent properties of Be- ing, instead of as abstracted relations. In fact, two phases of inquiry accompany each other and correspond to each other. In one of these phases, everything in qualitative objects ex- cept their happening is ignored, attention being paid to quali- ties only as signs of the nature of the particular happening in question: that is, objects are treated as events. In the other phase, the aim of inquiry is to correlate events with one an- other. Scientific conceptions of space, time and motion consti- tute the generalized system of these correlations of events. Thus they are doubly dependent upon operations of experi- mental art: upon those which treat qualitative objects as events, and upon those which connect events thus determined with one another.