Regarding whether or not we should call the 1905 mistakes “errors” or not, well I think we should and I’m positive that he realized they were errors. That’s why he had to change and alter the 1905 theory several times between 1907 and 1918. But he never wanted to call them “errors” in any public writings, and I think that’s because he was quite angry at some of the guys who were his most vocal critics. There were political reasons for this, and I’m not sure I blame him for what he did. At the time, I might have done the same thing, considering the hostile climate under which he worked in Europe, around the time of WW I.