OF THE AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE, TWENTY-NINTH MEETING, HELD AT Boston, Mass., AUGUST, 1880. SALEM: PUBLISHED BY THE PERMANENT SECRETARY. SECTION A. MATHEMATICS, PHYSICS AND CHEMISTRY. Address of ASAPH HALL, Vice President COMMUNICATIONS. Problems in Watson's Co-ordinates. Abstract. By THOMAS HILL On two New Instruments for the Determination of Time and Latitude. By some of the consequences of the hypothesis, recently proposed, that the intrinsic brilliancy of the Fixed Stars is the same for each star. By |