"...a term used by the Germans to indicate the knowledge which is necessary or useful for understanding
or practising an art or science, or which unfolds its nature and extent, and the method of learning it. It is applied,
therefore, not only to special introductions to particular branches of study, but also to auxiliary sciences, logic, philology, etc., and the encyclopaedic views of particular branches of science which facilitate
an insight into the relations of the parts. Such a survey can be presented only by one who has studied a science in
all its ramifications. The term propaedeutics is often, of course, merely relative : thus philology belongs to the propaedeutics of history, while it is itself the main study of a certain class of scholars. The term, however, in its common use, is generally restricted to the body of knowledge, and of rules necessary for the study of some particular science — rules which originate in the application of the general laws of science or art to a particular department.
Thus we find in the catalogues of lectures to be delivered in German universities medical propaedeutics, &c., enumerated."