Treatise on the justice, policy, and utility of establishing an effectual system for promoting the progress of useful arts, by assuring property in the products of genius : To which are added observations, on the deficiency of, and exceptions to the bill reported in March 1792. : With notes, tending to demonstrate, that no property is secured in the products of genius, under the existing patent system. : Also, the principles upon which a bill ought to be formed, to be effectual and equitable. /