Sometimes textbook authors operate under a handicap. The subject matter can be experienced as dry, especially by introductory students. This author, Edwin G. Boring, operated under a different handicap: his name.
Somehow, I see this also as a handicap in getting students to enroll in his courses.
By the way, he wrote A History of Experimental Psychology, which was published back in 1950. It's a challenging textbook, and Professor Boring very liberally threw German expressions around.