Although during the last sixty years philology has attained a high degree of development, looking at the literature available, Etymology appears only to have reached the level of philology at the turn of the century. This dictionary is the first major work of its kind in the 20th century, and as such, embodies the findings of modern philological scholarship. For example, full reference is made to Tocharian, the extinct language rediscovered at the end of the Nineteenth Century which often provides the key to the important transition form between the Old-Indian and the Indo-European group of languages to which English belongs.