By thus ascertaining the meaning of single words, the foundations of the scientific interpretation of the Vedas were laid in the great Sanskrit Dictionary, in seven volumes, published by Roth in collaboration with Böhtlingk between 1852 and 1875. Roth's method is now accepted by every scientific student of the Veda. Native tradition is, however, being more fully exploited than was done by Roth himself, for it is now more clearly recognised that no aid to be derived from extant Indian scholarship ought to be neglected. Under the guidance of such principles the progress already made in solving many important problems presented by Vedic literature has been surprising, when we consider the shortness of the time and the fewness of the labourers, of whom only two or three have been natives of this country. As a general result, the historical sense has succeeded in grasping the spirit of Indian antiquity, long obscured by native misinterpretation. Much, of course, still remains to be done by future generations of scholars, especially in detailed and minute investigation. This could not be otherwise when we remember that Vedic research is only the product of the last fifty years, and that, notwithstanding the labours of very numerous Hebrew scholars during several centuries, there are, in the Psalms and the Prophetic Books of the Old Testament, still many passages which remain obscure and disputed. There can be no doubt that many problems at present insoluble will in the end be solved by that modern scholarship which has already deciphered the cuneiform writings of Persia as well as the rock inscriptions of India, and has discovered the languages which lay hidden under these mysterious characters.