THE sixty-first meeting of the American Association for the Advancement of Science and of its affiliated societies was held in Boston, Mass., December 27, 1909, to January 1, 1910, under the presidency of Dr. David Starr Jordan, of Leland-Stanford University, California. The meeting was a large one, nearly 1100 members of the association being registered, and the total number of men and women of science in attendance was not far from 2000. The number of affiliated societies was larger than usual, numbering thirty in all. The meetings were held in the buildings of the Massachusetts Institute of Technology, in certain of the buildings of Harvard University, Cambridge, and the new Harvard Medical School in Boston. These three groups of buildings are rather widely separated, and for this reason it was difficult to bring together the exact registration.