Identifing a Font Used in Dr. Johnson's Rasselas, Printing of 1790

Question

I suspect it's Caslon, which was typical of the time, but it could be Baskerville.

Answer 1

Your instincts are right. Here's a 1785 Caslon specimen. The Paragon size may be it:

 

More specimens and Caslon info at Fonts In Use.

Comments

Looks like the Great Primer is a better match (see ‘g’). Shows how much metal type could differ at each size.

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I had zoomed in a bit for those samples. It seems like Great Primer was used for larger-print books. This is a link to this book itsef: https://www.google.com/books/edition/Rasselas/MZlezec-OvsC?hl=en&gbpv=0

I assume that either font would work well in a Google Slides theme I'm creating for Pride & Prejudice. 

I could also use this font, which I suspect is Caslon.