On the 10th inst, the British ship Lean-der arrived at this port with the Earl of El-lesmere on board, as the chiei appointed British Commissioner ; Sir Charles Lyell arrived the week before at Boston, Prof. Wilson, Messrs. Dilke, Wallace, and Whitworth, other Commissioners have also arrived. The Earl is accompanied by his lady, the Countess of Ellesmere, his son and two daughters. The Earl is altogether too fast for our Crystal Palace folks. We believe it is his in-Sention, as the Crystal Palace is not yet ready to open, to proceed immediately to Niaga-Falls, and thence to Canada,'where he will remain until the middle of July.