Full Idea
The rise and fall (as we presently perceive them) of aesthetics have been contemporaneous with the rise and fall of Romanticism.
Gist of Idea
Aesthetics has risen and fallen with Romanticism
Source
Roger Scruton (Recent Aesthetics in England and America [1980], p.3)
Book Reference
Scruton,Roger: 'The Aesthetic Understanding' [Methuen 1983], p.3
A Reaction
Maybe it started a little before Romanticism, as part of the Englightenment aim of being rational about everything, and maybe it survives Romanticism because we want to be scientific about everything.