The historical-comparative approach to the Armenian material has resulted in a number of new suggestions and modifications of earlier theories, summarized in two sections on the general development of Indo-European into Armenian, one on phonology and one on morphology where an occasional tentative glimpse at the pre-history of the proto-language is ventured.

The non-indigenous parts of the vocabulary, mostly Iranian loanwords and words of a more or less obscure origin, are listed in appendices.