Full Idea
It belongs to the sense of anything contingent to have an essence and therefore an Eidos which can be apprehended purely.
Gist of Idea
The sense of anything contingent has a purely apprehensible essence or Eidos
Source
Edmund Husserl (Ideas: intro to pure phenomenology [1913], I.1.002), quoted by Victor Velarde-Mayol - On Husserl 3.2.2
Book Reference
Velarde-Mayol,Victor: 'On Husserl' [Wadsworth 2000], p.44
A Reaction
This is the quirky idea that we can know necessary categorial essences a priori, even if the category is currently empty. Crops us in Lowe. Husserl says grasping the corresponding individuals must be possible. Third Man question.