For such fields deep historical studies can have considerable contemporary relevance and hence fall within the boundaries of the field itself. Weber … - Kurt Danziger

Newtonian studies are not part of physics but belong to an altogether different discipline, the history of science.

For applied psychology, whether American or German, it never had the slightest appeal, as is shown by the figures for the relevant journals, Zeitschrift fiir angewandte Psychologie, Journal of Applied Psychology, and Journal of Educational Psychology. Applied psychology had committed itself to knowledge goals that were unlikely to be advanced by the kind of investigative practice associated with Wundt's laboratory. What it was after was knowledge that could be quickly utilized by agencies of social control so as to make their work more efficient and more rationally defensible.

Wundt sought to achieve was a rejuvenation of philosophical inquiry by new means, not the constitution of a completely new discipline.

In the case of psychology, of course, it is not only the concepts and methods of the discipline that undergo constant historical change, but the very subject matter itself. Human subjectivity, the reality behind the objects of psychological investigation, is itself strongly implicated in the historical process, both as agent and as product.