Page:Theophrastus - History of Stones - Hill (1774).djvu/323

 The obvious Characters giving an artificial Method; and the Conideration of their Origin a natural one.

Nor is it more difficult, with due Care and Attention, to follow the everal other Foils thro' their gradual Approaches to Perfection, in their various Kinds; and by marking the Degrees and Steps of this Acent, to lay down a ure Foundation of the mot deirable of all Attainments in this Study, a natural Method: Dividing them into Genera, Species, Varieties; and a yet ubordinate. Ditinction to all, Varieties of Varieties. For Intance; Genus.