Miss Manners: I found typos in my friend’s book, should I tell?

DEAR MISS MANNERS: I am a writer and editor by profession, so I read books with a critical eye. I bought a book written by an acquaintance of several years (nonfiction). I read the book and found several typos, one very noticeable, and one egregious error of fact.

Should I let my acquaintance know what I found? How can I, without insulting them? Or should I just keep my findings to myself? I don’t think my acquaintance knows my profession.

GENTLE READER: It is not so much “how” you should do this, as “why.” Can the errors be corrected at this point?

Miss Manners gathers that it is a printed book, rather than an e-book. If so, you can ask if it is going into a second edition.

(Please send your questions to Miss Manners at her website, www.missmanners.com ; to her email, dearmissman