In 1740s, while Johnson's son William Samuel Johnson was attending Yale, Johnson collaborated with Rector Thomas Clap to create a new curriculum, for which he revised his moral philosophy and his tables on the sum of all knowledge. He published it as a textbook titled "An Introduction to the Study of Philosophy (1743)". It was three times longer than his previous essay. In large bold letters on the front page facing the title page, he proclaimed it "A New System of Morality". The work "was intended from the beginning to accompany President Clap of Yale's 1743 "Library Catalogue of the Library of the Yale–College in New Haven"."