Chapter 13 was about the tools of logos. Rhetorical logic is much more persuasive and interesting than the logic taught in philosophy classes. The audience is just as important as the information in rhetoric. Many people have a hard time finding an argument's proof and conclusion. The word "because" will identify an argument's proof.
I learned that a hypothesis in a lab report is similar to the second kind of syllogism. They both use if, then. I also learned that a premise usually begin with "because" or implies it.