In the sphere of the practical sciences the divisions of the theoretical sciences must repeat themselves. We have thus applied physical, applied psychological, applied normative and applied historical sciences, and it is again the antithesis of psychological and of historical sciences which is of utmost importance and yet too often neglected. The application of physical sciences, as in engineering, medicine, etc., or the application of normative knowledge in the sciences of criticism do not offer logical difficulty, but the application of psychological and historical knowledge does. Let us take the case of pedagogy or of penology, merely as illustrations. Is the application of phenomenalistic psychology or the application of teleological voluntarism in question? Considering the child, the criminal, any man, as psychophysical apparatus which must be objectively changed and treated, we have applied psychology; considering him as subject with purposes, as bearer of an historical civilization whose personalities must be interpreted and understood and appreciated, then we need applied historical knowledge. In the first case the science of pedagogy is a psycho-technical discipline which makes education mechanical and deprives the teacher of the teleological attitude of inner understanding; in the second case it is a science of real education far removed from psychology. All the sciences which deal with service in the system of civilization, service as teacher, as judge, as social helper, as artist, as minister, are sciences which apply the teleological historical knowledge, and their meaning is lost if they are considered as psycho-technical sciences only.