Lined with mother-of-pearl and scarlet mussels, resting on beds of soft sponge or purple moss-tufts, these fairy grottoes are the favorite retreat of King Crab and his myrmidons, of the star-fish and sea-urchin. Twice in every twenty-four hours the basins are refilled with pure sea-water, than which nothing can be more transparent. Strange that these rugged crags, where the grasp of man would be loosened by the first wave, should be instinct with life! It required some force to detach a mussel from its bed, and you must have recourse to your knife to remove the barnacles with which the smoother rocks are incrusted. John Adams, when he first saw the sea-anemone, compared it, in figure and feeling, to a young girl's breast.

Mount Desert has been familiar to two of the greatest of American naturalists. When Audubon was preparing his magnificent "Birds of America," he visited the island, and I have no doubt the report of his rifle was often heard echoing among the mountains or along the shores. Agassiz was also here, interrogating the rocks, rapping their stony knuckles with his hammer, or pressing their gaunt ribs with playful familiarity. Audubon died in 1851. Agassiz is more freshly remembered by the present generation, to whom he made the pathway of Natural Science bright by his genius, and pleasant, by his genuine, whole-hearted bonhomie.

In 1858 the French Government devoted itself, with extreme solicitude, to the reorganization of the administration of the Museum of Natural History of the Jardin des Plantes at Paris. It appears that, in spite of a first refusal, several times repeated, Agassiz at length consented to accept the direction of the museum. The Emperor, who had formed a personal acquaintance with the celebrated naturalist during his sojourn in Switzerland, pursued with customary pertinacity his favorite idea of alluring M. Agassiz to Paris. He was offered a salary of twenty-five thousand francs; and it was understood he was promised, besides, elevation to the dignity of senator, of which the appointments were worth twenty-five thousand francs more.

DEVIL'S DEN AND SCHOONER HEAD.

I have thought it fitting to give Agassiz's own report of his first introduction to an American public:

"When I came to Boston," said he, "the first course which I gave had five thousand auditors, and I was obliged to divide them into two sections of twenty-five hundred each, and to repeat each lesson. This course was given in the large hall of the Tremont Temple."

"Do you think," he was asked, "that in such a crowd it was the fashion or the desire for instruction which dominated?"