A great part of his theoretical work consists in resurveying things supposed superficially to be already known, and elaborating their theory into precision and completeness.
He still continued his yearly experimental contributions to the North American Review, elaborating them with a view as much to ultimate historical proficiency as to immediate literary effect, the essays on Scottish Song (1826), Novel-Writing (1827), Moliere (1828), and Irving's Granada (1829)) belonging to this preparatory period.
Singularly conscientious fashion of elaborating his ideas made the mental strain more intense than even so exhausting a work as the abstract exposition of the principles of positive science need have been.
In the work of expanding and elaborating this theme the successors of Geoffrey went as far beyond him as he had gone beyond Nennius; but he retains the credit due to the founder of a great school.
No doubt he was employed mainly, as Pliny testifies, in retouching and elaborating his general history.
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