""A Defense of the Original Principles of the Society of Friends: In a Series of Letters"" is a book written by Henry Martin in 1836. The book is a defense of the original principles of the Society of Friends, also known as Quakers. The Society of Friends is a religious organization that began in the 17th century in England. The book is written in the form of letters, and Martin addresses various issues that have arisen within the Society of Friends,...