Whitehead disagrees about the addition of *3.03—it is not a primitive proposition of their logical system. God would not need it.

[The letter refers to *3.03 mentioned on p. 14 of Principia: it "must stand", but alterations can still be made to the mentions on p. 101 in sheet 7, and 114—thus supporting the view that printing proceeded sheet by sheet until a revised sheet was correct and printed off, at which stage it was no longer subject to change.]