All people can see this; but not all people can see further, or define the Differentiae.
"Thoughts on Religion"
George John Romanes
But it is also essential to the understanding of this thesis that the Differentiae of the hereditary factors should be clearly grasped.
"Darwin and Modern Science"
A.C. Seward and Others
At first sight it would not appear to be a quite satisfactory account of the process in cases where the generic notion exhibits a mode of being which can be embodied only in one or other of a number of alternative specific modes by means of Differentiae not found in any things lying outside the genus itself.
"Ontology or the Theory of Being"
Peter Coffey