The Patent Hat: Designed To Promote The Growth Of Certain Undeveloped Bumps is a book written by Philo in 1855. The book is a treatise on a hat that is designed to promote the growth of certain undeveloped bumps on the head. The author claims that these bumps are related to the faculties of the mind, and that by promoting their growth, one can enhance their mental abilities. The book goes into detail about the history of the idea, the science behind...