Hermes

“The semantic theory proposed by Harris in Hermes (1751) is certainly deserving of our attention because it is a perceptive analysis of the logico-semantic structure of language. In the tradition of philosophical or universal grammar, Harris argued that the subject matter of the linguist should be the conceptual level or the deep structure of language rather than the utterance or the surface structure.
Therefore, Harris reasoned that an adequate explanation of meaning required a description of the relationship of language and thought. Furthermore, since he recognized that the study of language was necessary for the advancement of learning, which he considered to be the essence of science, he regarded the limits of 18th-century science too narrow in that they excluded semantics.
Harris’ theory advanced that an analysis of the sentence, the basis of the synthesis of the mind and language, was crucial to a semantic theory. Since the number of utterances is infinite, Harris attempted to discover a finite and universal set of psychological principles which he believed generated sentences. Although he concluded that a notion of general and particular ideas would ultimately explain verbal communication, he hoped that identifying the source of these ideas would be the work of future scholars”.
Excerpt from book review by Joseph L. Subbiondo; published in Historiographia Linguistica, Volume 3, Number 3, 1976, pp. 275-291