It turns out that, in a Yahoo! search for "Lady Mary Shepherd," Siris is currently number 10. This is even better than one might expect, given that most of the top 20 are either Thoemmes Press or the great Margaret Atherton, whose little anthology first interested me in her. Actually, this is an unfortunate sign of the general neglect of this astute nineteenth century philosophical thinker.
Siris is number 21 in the Yahoo! search for "Berkeley, Siris".
It is number 27 in the Yahoo! search for "Berkeley, Tar-Water".
I'll probably be posting something on all three of these topics next month, so in the unlikely event of people performing Yahoo! searches for these phrases, they won't be disappointed at the result.