{weekend words} "a mummified world of books"

I haven't done a weekend words for ages, but I've just read this passage about a gorgeous library in John Dickson Carr's He Who Whispers (1946):

And in a long room at the rear of the house – a room after his own heart – stood Miles Hammond, holding a lamp above his head.

'It's all right,' he was saying to himself. 'I didn't make a mistake in bringing her here. It's all right.'

But he knew in his heart that it wasn't all right.

The flame of the little lamp, in its tiny cylindrical glass shade, partly drew the shadows from a mummified world of books. It was wrong, of course, to call this place a library. It was a stack-room, a repository, an immensely long dust-heap for the two or three thousand volumes accumulated like dust by his late uncle. Books old and broken, books newish and shiny, books in quarto and octavo and folio, books in fine bindings and books withered black: breathing their exhilarating mustiness, a treasure-house hardly yet touched.

Their shelves reached to the ceiling, built even round the door to the dining-room and enclosing the row of little-paned windows that faced east. Books piled the floor in ranks, mounds, and top-heavy towers of unequal height, a maze of which the lanes between were so narrow that you could hardly move without knocking books over in a fluttering puff of dust.

Standing in the middle of this, Miles held the lamp high and slowly looked round him. 'It’s all right!' he fiercely said aloud.

And the door opened, and Fay Seton came in.

*

I do feel a little sorry for the mysterious Miss Seton, who will be doing the dusting in here!