Better analysis of Problem 1 on page 196
Some of our after-class discussion of this problem obscured an important point:
When B dies, he has no property interest in Blackacre, because O's heirs cannot be ascertained yet, and O has made no inter-vivos transfer to B. So his will does not convey any interest in Blackacre to his wife, W. When O dies later, he dies intestate, so the question is who his heirs are. Primogeniture, in effect in 1800, disregards all but the oldest male heir. B2 is the oldest (and at the time of O's death, the only) male heir. So B2 gets a fee simple interest in Blackacre.