New-York, July 1, 1776. By the arrival of Capt. Williams at Philadelphia from St. Eustatia, we have the following letter, which was received in this city yesterday evening. London, April 9, 1776. It will no doubt be entertaining to you to know something truely of the plan formed by the Ministry here against America ... The designs of the British Cabinet are to make the greatest effort possible this year to reduce America to an unconditional submission ..