To the Editor: Well, that was a surprise! I actually read a book, "Wild Minds," by Reid Mitenbuler, before it was reviewed in the Book Review (Jan. 10). Growing up with a child's delight for the Saturday matinee cartoons of the 1940s, I have always had a certain nostalgic fascination for the art of animation. With that incentive I eagerly devoured the book. I also quite enjoyed Michael Tisserand's review, though my own notes reveal some other interesting facts. For example: Winsor McCay, often considered the greatest of the early animators, used his artistry to make a film in 1918 about the sinking of the Lusitania because there were no actual photographs of the event. Max Fleischer (who adapted "Popeye" and "Superman") moved his studio to Florida, when most film studios were moving from New York to California. And I was certainly surprised by the revelation that many animation artists made pornographic films for one another's enjoyment, probably because it was almost exclusively a male enterprise.