In spite of the book's title, most of these observations have little to do with floor trading. Instead, they are more general comments on markets. It also includes a discussion of the fundamental reason why the trades work. Charts show an analysis of the average seasonal movement of the spreads over the last 10 to 20 years. Except for the spreads, there is almost no credible evidence to show that the advice would actually make money.
Some observations are undoubtedly profitable trading advice, and some are probably folklore.
It is impossible to separate one from the other. However, the book is still valuable to the independent trader who develops and tests his own trading strategies.