This is one of two books that I was reading near the same time that focus on writer's libraries and reading habits, using the various quotes and allusions they make in their book. The first, on Polycarp, provided some interesting asides and observations but largely was trying to make some larger points about Paul's influence; this one, on Eusebius, is set up more like a reference book, insofar as Carriker discusses each allusion in alphabetical order (split out by kind of source). In that manner, Carriker sets off to reconstruct what exactly was in Eusebius's library at Caesarea, when he wrote such books as his Church History, his Life of Constantine, and his Chronicle.
I read the book largely because I was interested in knowing more about the library at Caesarea (and at Jerusalem). Carriker tries, on some level, to reconstruct what those libraries, particularly the former, were like and how they originated, but in the end, the best we can do is theorize. We know the Eusebius had an eccesiastical library he used there in the city and that Origen some years earlier also used it (and perhaps even provided a large share of its books). Beyond that, it's really hard to say exactly when it was founded and by whom.
I was drawn to the subject because of a claim one writer made that the earliest complete New Testament manuscripts were deposited at this library, along with other important libraries, such as Alexandria (in the early 100s CE). It's an interesting theory, and certainly, as Carriker shows, this library had many Old Testament manuscripts and also was the source of the New Testament manuscript later sent to Constantine (in the 300s), when he requested copies of it, but there isn't, alas, absolute certainty about when such manuscripts were deposited in the Caesarean library—and thus, no certainty, in that regard, about when that first edition of the New Testament was completed. And that, of course, is why the canon debate (what did second-century writers really consider canonical of the New Testament writings) can continue. Still, the fact that Constantine could request such would suggest that, despite Eusebius's misgivings about certain New Testament books, as noted in his Church History, what was actually part of the New Testament had been well enough settled that one could request a copy of it.
