He used Wheloc's edition, and E, with collations or transcripts of B and F.
In the latter case what we have are not "collations," for the art of collation was not understood till the 10th century, but selections or "excerpts" of readings which we have reason to fear are often imperfect and erroneous.
His two first editions (1546, 1549) were based on Erasmus, the Complutensian, and collations of fifteen Greek MSS.
The collations were made for him by Archbishop Ussher.
It gives the text of Stephanus (1550) with collations of 78 MSS., besides those of Stephanus, the readings of the Old Latin, so far as was then known, the Vulgate and Peshito, together with full and valuable prolegomena.