Based on the work of the Judges. Don't leave out that important detail.
It is a book by one Judge of the Court of Common Pleas of the Fifth Judicial District of Pennsylvania entitled A Digest of Select British Statutes, published in 1817. It is a must read for anybody who has absolutely nothing better to do.
It was a widespread and widely used book of law in Pennsylvania, and it was so successful and so much in demand that they did a second printing of it in 1847. And yes, it still includes the statement that Citizenship in America is based on Vattel.
You can't refute the book, so you try to pretend it doesn't have the authority behind it that it really has.
There is no way that Samuel Roberts could have published that book while attributing it to the work of those Judges without it being true.
You may be surprised to learn that Judges of the Pennsylvania Supreme court knew how to sue, or better yet, just issue an injunction. :)