What were the unexpected results of the experimental treatment on the rats during the training period?

I'm sorry, I see no evidence of a chapter entitled "A Lesson in Reading". Please provide the correct chapter number for your question.

Dr. Schultz didn't know that the rats could read completely. He also didn't know that they could read sentences. This led to them figuring out how to get out of their cages and them escaping from the NIMH laboratory.