GEOLOGISTS throughout the world will be grieved to hear that one of the best known and most illustrious of their number, M. de Lapparent, has passed away after a brief illness. It seems but yesterday since, with so notable a company of his fellow-countrymen, he attended the centenary celebrations of the Geological Society here, apparently in the fulness of health, and with still many years of vigorous life before him. Lately, however, he had not been well, and for a time his condition had even given cause for some anxiety. But the danger seemed to have passed off, and his friends hoped soon to welcome him back to his place at the Academy of Sciences in Paris. But a rapid change for the worse supervened, and he died in the early part of last week at the age of sixty-seven years.