The first two, "theoretical," books examine the powers of a court of equity as derived from justice and from utility, the two great principles Kames felt governed equity. The third book aims to be more practical, showing the application of these powers to several subjects, such as bankrupts. Principles of Equity is significant as an example of the approach of an Enlightenment thinker to practical legal questions and as an early attempt to reduce law to principles. There is evidence that this book was well known in the formative years of the United States and that both Benjamin Franklin and Thomas Jefferson were familiar with Kames's treatise. Henry Home, Lord Kames (1696-1782), one of the leaders of the Scottish Enlightenment, was a judge in the supreme courts of Scotland and wrote extensively on morals, religion, education, aesthetics, history, political economy, and law, including natural law.