I haven't put the title very well, but...
In many books (classics) there is an introduction, often by someone eminent, often informative and instructive about the book to follow.
But I was wondering today exactly why are they at the beginning of the novel rather than at the end? They invariably contain major spoilers, and also one doesn't want someone's opinion before one has read the book, but afterwards.
I often return to read the Introduction after I have finished, but it would seem to make much more sense to continue reading once the book had ended, rather than turn back to the start.
Can anyone involved in publishing enlighten me?