Whitney was among the first to contest Schleicher's concept of language as a natural fact, claiming, instead, that it has social nature, as an ‘institution’ created by man; he was a forerunner in recognizing the relevance of signs and their value, and of language acquisition. In his demonstrations and in his methods he proposes a science of historical linguistics but at the same time it is open to 20th century linguistics and the concept of language as a complex system ordered and crossed by relationships. Both his unique approach to the study of Sanskrit, which emphasised the study of its use and its variants, and his interest for modern languages, makes him a particularly interesting scholar, as he and his reception testify the rise, in Europe and especially in Italy, of a new approach to linguistic issues, no longer exclusively historical-comparative, but also theoretical and general.