OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES. NEW SERIES. VOL. IX. WHOLE SERIES. VOL. XVII. FROM JUNE, 1881, TO JUNE, 1882. SELECTED FROM THE RECORDS. BOSTON: UNIVERSITY PRESS: JOHN WILSON AND SON. 1882. I. II. III. CONTENTS. - IV. Thermoelectric Line of Copper and Nickel below 0°. V. Crystalline Form of Cryolite. By W. H. MELVILLE VI. Researches on the Complex Inorganic Acids. Phospho-molyb VII An Indirect Determination of Chlorine and Bromine by Elec- On Certain Substances obtained from Turmeric. BY C. LORING JACKSON and A. E. MENKE . Contributions to North American Botany. BY ASA GRAY XIII. The Wedge Photometer. BY EDWARD C. PICKERING CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF HARVARD COLLEGE. BY JOSIAH PARSONS COOKE, Director. Presented May 11, 1881. INTRODUCTION. In a paper presented to the Academy, and published in its proceedings, Vol. XIII., page 1, we gave the results of our investigation of the haloid compounds of antimony up to that time, including a revision of the atomic weight of this element. We did not directly answer the criticism which this paper called forth, except so far as to present to the Academy, March 10, 1880, and to publish in these Proceedings, Vol. XV., page 251, a preliminary notice of experiments then in progress which furnished the best possible answer to the unfounded assumptions of the critic. We also gave brief notices of our work from time to time in the American Journal of Science. But now that the work is ended for the present (or at least must be suspended for a considerable period), we propose to bring the results together in the present paper. I. THE OXIDATION OF HYDROCHLORIC ACID SOLUTIONS OF ANTIMONY IN THE ATMOSPHERE. In our first paper (loc. cit., page 21) we made the following incidental observation, in explanation of certain precautions which we VOL. XVII. (N. S. IX.) 1 |