Birth-day Festivities - On Tuesday, the anniversary of Sir John St. Aubyn's birth, was celebrated at his beautiful and romantic seat, St. Michael's Mount, with more than usual spirit and clat. The morning was ushered in with the roar of cannon from the batteries on the summit, at mid-day the usual salute was fired, amid the shouts of the inhabitants, and with flags flying in all quarters; and in the evening, all the beauty of the place (and no where is more Beauty to be seen) assembled at a dance in the village. It was truly a festival..... the dance continued until a late hour, and the youth of the place - the female portion in particular - fully maintained the high character they have long enjoyed, for elegance and skill in this favourite and fascinating amusement.