an eminence on the E. side of the valley, is visited for the view is affords of the vast ‘sea of ice' which fills the highest basins of the Mont Blanc chain in three branches…and descends into the valley in a huge stream of ice, about 4 ½ M. long and ½-1 ¼ M. broad, called the Mer de Glace above the Montanvert and the Glacier des Bois below it.