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 to the Crown to exempt the Assembly from the influence of proprietary instructions and to make the proprietary estates bear a more equitable proportion of the taxes. To get the Assembly's case before the public, he collaborated with an unknown hand on An Historical Review of the Constitution and Government of Pennsylvania, published in 1759. The result was a compromise which in the circumstances he regarded as a victory. His interest in the wider questions of imperial policy he exhibited in 1760 by aspersing the advocates of a hasty and inconclusive peace with France in his stinging little skit, Of the Meanes of Disposing the Enemies to Peace, which he presented as an extract from the work of a Jesuit historian. In 1760, also, he was joint author with Richard Jackson of a notably influential argument for the retention of Canada, The Interest of Great Britain Considered with Regard to Her Colonies; to which was appended his Observations Concerning the Increase of Mankind, Peopling of Countries, etc. In the intervals of business, he sat for his portrait, attended the theatre, played upon the armonica, experimented with electricity and heat, made a tour of the Low Countries, visited the principal cities of England and Scotland, received honorary degrees from the universities, and enjoyed the society of Collinson, Priestley, Price, Hume, Adam Smith, Robertson, and Kames. He returned to America in the latter part of 1762. In 1763 he made a 1,600-mile tour of the northern