THE CORAL ISLANDS.---THEIR NATURE, GROWTH, AND rock ill explained partly by the mechanical action of the President F. A. P. Barnard gave a learned exposition of GEOGRAPHICAL DISTRIBUTION. waves, and partly by the destruction of the coral insect by the theory of magic squares, which are arithmetical puzzles, LECTUEE DELIVEEED AT THE STEVENS INSTITUTE OF TECIINOLOGY BY the sea urchin and other animals that feed on it. The waves e.stremely abstruse and of no immediate practical value. PEOFESSOE A.
... GUYOT. OF PRINCETON, N. J. disintegrate the structure formed by the animal, and then roll I Professor Henry, President of the Academy, in reviewing ba�k the coral sand thus produced upon it, where it under· I scientific progress, said that it was contemplated to con animal which makes I crease of the earth's temperature at progres;ive depth�-also counter a calm sea and fair weather on the magnificent it cannot live out of the water. The little architects :retain new investigations on the velocity of light. The work of waters of the Pacific o�ean, with its thousands of islands far enough sea water to last them over until the next tide and weighing the earth accurately will also, probably, be un· away from any coast. Those who are familiar with the are so enabled to work up to the highest watermark. Ac-dertaken anew. glowing narrations of Captain Cook and other navigators tinia have been observed all closed up on the rock at low P.rofessor Mayer also read a s�ond paper, showing how will remember that the presence of an island is recogniz ld, water, and then suddenly opened ltke magnlficent flo wers, certain sounds would extinguish the sensation of otl. r long before it becomes visiblol, by clouds directly above it 5 and 6 inches In diameter, when the tide rose. Eoundil; and adduced the rule that, while low sounds C1nnot