From Charleston

Boston, Nov. 24. A correspondent of tbe Travellcr WPiting írom Folly I.-sland, lGth, saya the loss oí the rebt;!s is said to be from uve to fifteen daHy. Our cnsualties a íew duys ago wero fully equal to tho rebeif, but now that the most eñectivo rebel batteriea are siloncod our casualties iré raro. Fort Suirptersoöerein raeok ailence, not displayiug ov.;n her Eag more than half thu time. Porta Moultriy and Johnson ehoot witli no great vigor and our men eaeily dodga under cover and avoid danger. Heafitime ncw ibrls are being throwp up on tliis and adíacent Blanda whic'h wil] shorily coraniíind all tho oavigable channels and Lve relief tb our lilbckading squadron. Síówly but surely the work goes on.