Behold in that semicircular low-browed cliff, backed by a range of bonny green braes dipping down from the hills that do themselves come shelving from the mountains, what appears at first sight to be a cave, but is merely a blind window, as it were, a few feet deep, arched and faced like a beautiful work of masonry, though chisel never touched it, nor man's hand dropped the line along the living stone thus wrought by nature's self, who often shows us, in her mysterious processes, resemblances of effects produced by us her children on the same materials by our more most elaborate art. It is a very pulpit, and that projecting slab is the sounding-board. That upright stone in front of it, without the aid of fancy, may well be thought the desk. To us sitting here, this spot of greensward is the floor; the sky that hangs low, as if it loved it, the roof of the sanctuary; nor is there any harm in saying, that we, if we choose to think so, are sitting in a kirk. Shall we mount the pulpit by that natural flight of steps, and, like a Sedgwick or a Buckland, with a specimen in one hand, and before our eyes mountains whose faces the scars of thunder have intrenched, tell you how the globe, after formation on formation, became fit residence for new-created man, and habitable no more to flying dragons? Or shall we, rather, taking the globe as we find it, speculate on the changes wrought on its surface by us, whom God gave feet to tread the earth, and faces to behold the heavens, and souls to soar into the heaven of heavens, on the wings of hope, aspiring through temporal shades to eternal light? Brethren!--The primary physical wants of the human being are food, clothing, shelter, and defence. To supply these he has invented all his arts. Hunger and Thirst cultivate the earth. Fear builds castles and embattles cities. The animal is clothed by nature against cold and storm, and shelters himself in his den. Man builds his habitation, and weaves his clothing. With horns, or teeth, or claws, the strong and deadly weapons with which nature has furnished them, the animal kinds wage their war; he forges swords and spears, and constructs implements of destruction that will send death almost as far as his eye can mark his foe, and sweep down thousands together. The animal that goes in quest of his food, that pursues or flies from his enemy, has feet, or wings, or fins; but man bids the horse, the camel, the elephant, bear him, and yokes them to his chariot. If the strong animal would cross the river, he swims. Man spans it with a bridge. But the most powerful of them all stands on the beach and gazes on the ocean. Man constructs a ship, and encircles the globe. Other creatures must traverse the element nature has assigned, with means she has furnished. He chooses his element, and makes his means. Can the fish traverse the waters? So can he. Can the bird fly the air? So can he. Can the camel speed over the desert? He shall bear man as his rider.