Definition of Classing:
- "Memoir of the Life of John Quincy Adams.", Josiah Quincy.
- "Worldly Ways and Byways", Eliot Gregory.
When engaged in 1828 in preparing for the press the treatise on geology above alluded to, I conceived the idea of classing the whole of this series of strata according to the different degrees of affinity which their fossil testacea bore to the living fauna.- "The Antiquity of Man", Charles Lyell.