While Johnson's moral philosophy had been taught at Yale since the early 1740s, his most influential textbook on philosophy was his 1752 "Elementa Philosophica. "This was a revision and major expansion of his 1731, 1743, and 1746 textbooks on moral philosophy to include metaphysics and science, made at the request of Benjamin Franklin. In 1752, Franklin printed a fine if expensive first edition in Philadelphia, while a lower cost second edition printed in London in 1754 appeared with Johnson's corrections and an introduction by Dr. William Smith, provost of the College of Philadelphia. It has been estimated that about half the students in American Colleges between 1743 and 1776 were taught Johnson's moral philosophy. According to Colonial College Historian, J. David Hoeveler, "In the middle eighteenth century, the collegians who studied" the ideas of the new-model colleges "created new documents of American nationhood". Three members of the Committee of Five who edited the "Declaration of Independence" were connected to Johnson: his educational partner, promoter, and publisher Benjamin Franklin of Pennsylvania, his student Robert R. Livingston of New York, and his son's legal and political protegee and Yale treasurer Roger Sherman of Connecticut. Indeed, it has been estimated that 54% of the contributors to "Declaration of Independence "between September 5, 1775 and July 4, 1776, and 50% of the men who debated and passed it between June 28 and July 4, 1775, were connected to Johnson or his moral philosophy, making it the dominant morality at the Congress.