Full Idea
Only In the course of the nineteenth century, and in the wake of Hegel's posthumously published lectures on aesthetics, did the topic of art come to replace that of natural beauty as the core subject-matter of aesthetics.
Gist of Idea
Nineteenth century aesthetics focused on art rather than nature (thanks to Hegel)
Source
report of Georg W.F.Hegel (Lectures on Aesthetics [1826], 5) by Roger Scruton - Beauty: a very short introduction
Book Reference
Scruton,Roger: 'Beauty: A Very Short Introduction' [OUP 2011], p.82