By this time, Otis had become not only a man eminent in his profession in Boston, but a powerful factor in the public life of the city. The New England commonwealth was then beginning to be greatly exercised over the aggressions of the Motherland, and this was keenly watched by Otis, who took a lively and patriotic interest in Colonial affairs. Beyond his profession, which had closely engrossed him, he had heretofore taken little part in public life; his leisure, indeed, he had employed more as a student of books rather than of national affairs, as his work on the "Rudiments of Latin Prosody," published in 1760, bears witness. As the era of a conflict with England neared, he however altered in this respect, and became a zealous advocate of non-interference on the part of the Crown in the affairs of the Colonies and an ardent protester against English oppression and injustice. Soon grievances arose in the relations between the Colonies and England which gave Otis the right to denounce the Motherland and excite dissaffection among the people of the New World. These grievances arose out of the strained commercial relations between the two countries and the attempt of England to devise and enforce irritating schemes of Colonial control. Of these causes of outcry in the New World the two chief were the revival and rigid execution of the English Navigation Acts, designed to limit the freedom of the American Colonies in trading with West Indian ports in American built vessels, and the insistence, on the part of the Crown and the British government, that the Colonies should be taxed for the partial support of English garrisons in the country. In the development of trade in the New World, the Colonies reasonably felt that they should not be harassed by the mother country, and so they permitted commerce to expand as it would; and when this was enjoined by England they naturally resented interference by her and began to evade the laws which she imposed upon the young country and bid defiance to the Crown customs officers in the measures resorted to in the way of restriction and imposed penalty. This attitude of the Colonists in ignoring or defying English laws was soon now specially emphasized when the Crown resorted to more stringent measures to curb Colonial trade and impose heavy customs duties on articles entering New World ports. Flagrant acts of evasion followed, and defiant smuggling at length brought its legal consequences--in the issue by the English Court of Exchequer of search warrants, or Writs of Assistance, as they were called, by which it was sought to put a stop to smuggling, by resorting to humiliating arbitrary measures sure to be resented by the Colonies. These Writs of Assistance empowered the King's officers, or others delegated by them, to board vessels in port and enter and search warehouses, and even the private homes of the Colonists, for contraband goods and all importations that had