Incidentally, the Royal Society has its own archive; this is not from JSTOR.
The Royal Society’s archive looks just as walled up as JSTOR’s. I picked out an arbitrary volume from 1693 and tried to get the full-text PDF for a paper, but it asks for a login. I don’t know if anyone can signup for free or has to buy an access package — in any case, it seems unnecessary to make people jump through hoops for papers that are (in their original form) public domain.
The Royal Society’s archive looks just as walled up as JSTOR’s. I picked out an arbitrary volume from 1693 and tried to get the full-text PDF for a paper, but it asks for a login. I don’t know if anyone can signup for free or has to buy an access package — in any case, it seems unnecessary to make people jump through hoops for papers that are (in their original form) public domain.