Abstracts on the Philosopher's Index
"The Philosopher's Index" is a commercial software once widely used to search for articles in philosophy journals. These days it is generally easier and faster to search on the open internet. (Even the company behind the Philosopher's Index is not quite sure why the Index is still needed.) However, there is one thing the Index has that can't be found anywhere else: many of its entries contain abstracts of books and articles, apparently provided by the authors themselves. These abstracts are often not part of the published versions, and they can be quite useful to get an authoritative summary, or to see what the author considered to be the main point of a paper.
For example, do you remember Lewis's analysis of dispositions in "Finkish Dispositions"? Probably not -- the analysis is too complicated. But here is the gist of it, provided in the abstract: A thing is fragile just in case it "has some intrinsic property such that if it were struck and it nevertheless retained that property, it would thereby be caused to break".
I found 82 abstracts for Lewis's books and papers on The Philosopher's Index, including two different abstracts for Parts of Classes. Unfortunately, the company that runs the Index holds a copyright on the abstracts, so I'm not allowed to post them. In the meantime, I've at least added them to the Lewis search engine. The results come up as part of the relevant book or paper, but with 'Abstract (PI)' in place of a page number.