[…] on the basis of Indo-European philology was built up the science of comparative philology.
- Whitney (1875), a pag.318

[…] while Germany is the home of comparative philology, the scholars of that country have […] distinguished themselves much less in that which we have called the science of language.
- Whitney (1875), a pag.318

Comparative philology and linguistic science, we may say, are two sides of the same study: the former deals primarily with the individual facts of a certain body of languages, classifying them, tracing out their relations, and arriving at the conclusions they suggest; the latter makes the laws and general principles of speech its main subject, and uses particular facts rather as illustrations. The one is the working phase, the other the regulative and critical and teaching phase of the science. The one is more important as a part of special training, the other as an element of general culture […].
- Whitney (1875), a pag.315