Blake's Lost & Found painting ...DE ANTRO NYMPHARUM ... Of The Cave Of The Nymphs ... painted in 1821, subject of a daunting 99-page 1963 essay by Kathleen Raine ... and more !

https://www.jstor.org/stable/27540892

i've taken screenshots of the first four pages in case you need to check out the approachability and lucidity of her writing ...

 

the image of the painting seems to have been scanned from a book ... when i find a proper archival digital image then i'll post it here.

LATER ... Hurrah ! ... The Blake Archive have an excellent zoom-able image 

https://www.blakearchive.org/preview/but803?descId=but803.1.1.pt.01

Vexingly, I then discovered Kathleen Raine's earlier 21 page essay from 1957 ...

https://www.jstor.org/stable/750785

... i haven't got the kind of intellectual curiosity and stamina needed to read both essays as closely as they deserve ... i'll go a little way until i wilt ... 

... but then she went on to publish "the book" ... BLAKE AND ANTIQUITY, 1977 ... 

https://collections.britishart.yale.edu/catalog/orbis:582095

Hmmm !  Where to begin ?

POST-SCRIPT ... of course, the lady herself was a force of nature and of intellect ...

https://en.wikipedia.org/wiki/Kathleen_Raine