All the descriptions have to trace familiar outlines, and to use familiar terms. The activity is, for example, attributed either to a physical or to a mental agent, and is either aimless or directed. If directed it shows tendency. The tendency may or may not be resisted. If not, we call the activity immanent, as when a body moves in empty space by its momentum, or our thoughts wander at their own sweet will. If resistance is met, _its_ agent complicates the situation. If now, in spite of resistance, the original tendency continues, effort makes its appearance, and along with effort, strain or squeeze. Will, in the narrower sense of the word, then comes upon the scene, whenever, along with the tendency, the strain and squeeze are sustained. But the resistance may be great enough to check the tendency, or even to reverse its path. In that case, we (if 'we' were the original agents or subjects of the tendency) are overpowered. The phenomenon turns into one of tension simply, or of necessity succumbed-to, according as the opposing power is only equal, or is superior to ourselves. Whosoever describes an experience in such terms as these describes an experience _of_ activity. If the word have any meaning, it must denote what there is found. _There_ is complete activity in its original and first intention. What it is 'known-as' is what there appears. The experiencer of such a situation possesses all that the idea contains. He feels the tendency, the obstacle, the will, the strain, the triumph, or the passive giving up, just as he feels the time, the space, the swiftness or intensity, the movement, the weight and color, the pain and pleasure, the complexity, or whatever remaining characters the situation may involve. He goes through all that ever can be imagined where activity is supposed. If we suppose activities to go on outside of our experience, it is in forms like these that we must suppose them, or else give them some other name; for the word 'activity' has no imaginable content whatever save these experiences of process, obstruction, striving, strain, or release, ultimate _qualia_ as they are of the life given us to be known.