conduct with a perfected mechanical co-ordination of the available means. We have now to see that much more may be involved in such a process as this than has been explicitly stated in our brief analysis. For the end itself may be a matter of deliberation, just as must be the physical means of accomplishing it; and, again, the means may call for scrutiny and determination from other points of view than the physical and mechanical. The final action taken at the end may express the outcome of deliberate ethical and economic judgment as well as of judgments in the sphere of sense-perception and physical science. Let us consider, for example, that one's end is the construction of a house upon a certain plot of ground. This end expresses the felt need of a more comfortable or more reputable abode, and has so much of general presumption in its favor. There may, however, be many reasons for hesitation. The cost in time or money or materials on hand may tax one's resources and injuriously curtail one's activities along other lines. And there may be ethical reasons why the plan should not be carried out. The house may shut off a pleasing prospect from the view of the entire neighborhood and serve no better end than the gratification of its owner's selfish vanity. It will cost a sum of money which might be used in paying just, though outlawed, debts. Now, from the standpoint of such problems as these the fullest possible preliminary knowledge of the physical and mechanical fitness of our means must still be very abstract and general. It would be of use in any undertaking like the one we have supposed, but it is not sufficient in so far as the problem is one's own problem, concrete, particular, and so unique. One may, of course, proceed to the stage of physical judgment without having settled the ethical problems which may have presented themselves at the outset. The end may be entertained tentatively as a hypothesis until certain mechanical problems have been dealt with. But manifestly this is only postponement of the issue. The agent is still quite unprepared, even after the means have been so far determined, to take the first step in the execution of the plan; indeed, his uncertainty is probably only the more harassing than before. Moreover, the economic problems in the case are now more sharply defined, and these for the time being still further darken counsel. Manifestly the need for deliberation is at this point quite as urgent as the need for physical determination can ever be, and the need is evidenced in the same way by the actual arrest and postponement of overt conduct. The agent, despite his physical knowledge, is not yet free to embrace the end and, having done so, use thereto the means at his disposal. It is plainly impossible to use the physical means until one knows in terms of Substance and Attribute or Cause and Effect, or whatever other physical categories one may please, what manner of behavior may be expected of them.