The Committee of this City a few days ago, transmitted to you an original letter from Governor Martin to Henry White, Esquire, from the contents of which it is very obvious that Governor Martin has formed designs very inimical to the friends of America. From authentick information we learn, that he is to receive a supply of gun powder from General Gage via New York, and that he has sent from North Carolina a cutter armed to receive it. She is a small boat, rigged like a schooner, mounts a few swivels, and is commanded by a Mr ——, the Lieutenant of the Famous Man-of-War; the vessel was formerly purchased in New York by Captain Collet. We in particular desire, in case she should arrive in your port, to know what steps you may think prudent to secure her and her Cargo. She is probably to receive the gunpowder from the Asia, or the other men-of-war lying in your harbor.