This book "asserts that the origin and spread of languages must be examined primarily through the time-tested techniques of linguistic analysis, rather than those of evolutionary biology" and "defends traditional practices in historical linguistics while remaining open to new techniques, including computational methods" and "will appeal to readers interested in world history and world geography."
Some think that it is not possible to lay down rules that would guide a stranger in acquiring a grammatical and accurate knowledge of the Welsh language. But surely those who have studied the language carefully will feel that it is possible to gain a perfect understanding of Welsh, its many idioms and peculiarities nonewithstanding.
This work was undertaken with the aim of faciliating the study of the Welsh language, and of lessening the difficulties that have been wholly passed over in silence by preceding grammarians. Hopefully it will surpass its predecessors and lay the base of a work that could pretend to the accuracy and completeness of the Latin and Greek grammars (adapted from the introduction).