To give a single illustration, though this may be quite superfluous, parallelism would view the life of a skilled labourer at work in his shop as a process in two parts. On the one hand, the environment, comprising not merely all the tools and materials, but also the body of the workman, moves as a mechanism, each part flying to its appointed task consistently with the particular thing to be done; and then, on the other hand, the mind and the will of the mechanic, not by any independent _ab extra_ causation, but [p.208] nevertheless at every thought or sensation coincidently and pertinently accompanies the environment's mechanical movement. Each process is consistent within itself, not following nor yet preceding, but accompanying the other in perfect step. What makes the environment so tractable or the mind so practical? The credit here has usually been given to a _tertium quid_, to God, who is so made more a mediator than a creator. God is the Great Paralleler. But the third condition that was to be met--how about that? Are the workman's mind and his environment each at once acting and acted upon? Are their two processes virtually one instead of two? and is the mediation accordingly, just in the fact of such unity instead of in some being acting as if from without? So far as the formal theory goes, as was said, this third condition is not fulfilled, but the theory cannot be understood as opposed to such unity; rather it is a first step and a long step towards an appreciation of it. The formal theory, alike in its assertion of the parallelism and in its view of God as mediator rather than positive creator, is an effective attack, consistent, as we have seen, with the demands of an honest, thorough-going scepticism, upon the fixed, independent, arbitrarily creative cause in any form. It does not openly assert causation in any other sense. Seeming quite oblivious, for example, of causation as action with an accompanying reaction, or of what I should style an organic or differential causation. But, besides making and needing to make no denial of this, it all but opens the door to recognition of such a view.