A letter to the Right Honourable Frederick J. Robinson, President of the Board of Trade, &c. &c. &c : on the subject of the proposed duties on colonial timber, and on some other colonial subjects, and on the relative situation of the British North American possessions, with the United States of America and Great Britain, pointing out the value and importance of the North British colonies to the parent state, and the means of increasing their mutual prosperity / by William Sabatier.