I remember that the edition of the magic mountain I read around 7 or 8 years ago contained an introduction that was written by Mann and inspired by a lecture he gave about his book. I remember it saying something along the lines that "writing the introduction in English makes it easier, just like how in the book Castorp's love was easier to confess in French, a language which is not his native one".
I'm trying to find that introduction again, but I cannot find it online and I'm not sure which edition(s) of the book have it, to make things worse I might be misremembering the details. So to make this into an explicit question: which edition(s) of the magic mountain have an introduction written by Mann? Is that introduction also available online?