OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES. VOL. II. FROM MAY, 1848, TO MAY, 1852. SELECTED FROM THE RECORDS. HARVARD UNIVERSITY HERBARIUM. THE GIFT OF Asa Gray. BOSTON AND CAMBRIDGE: METCALF AND COMPANY. 1852. PROCEEDINGS OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES. SELECTED FROM THE RECORDS. VOL. II. Three hundred and eighth meeting. May 30, 1848. ANNUAL MEETING. The VICE-PRESIDENT, Mr. Everett, in the chair. The Reports of the Treasurer, and of the Auditing Committee, were read by Mr. Peirce, in the absence of the Treasurer. Professor Gray, from the Committee of Publication, stated that there were various papers ready for publication, and that the materials at the disposal of the Committee were likely to be sufficient to furnish a volume of the Memoirs annually. He also communicated a paper from Dr. John L. Le Conte, of New York, giving an account of a new fossil pachyderm, the Platygonus compressus, found at Galena, Iowa. Mr. Bond communicated the following "OBSERVATIONS ON MAUVAIS'S COMET OF JULY 4TH, 1847, Made at the Cambridge Observatory. (Continued from Vol. I., p. 169, of the Proceedings.) 1848. d. h. m. s. h. mn. S h. m. 8. No. of 11 B. Z. 456. 12 2 66 12 B. Z. 280. Feb. 29 12 43 55 10 57 23.1 18 42 48 10 56 16.84 18 43 11.5 March 1 15 22 00 10 54 37.8 18 36 57 10 56 16.84 18 43 11.5 66 1 16 37 00 10 54 30.2 18 36 46 10 58 40.53 18 33 34.2 66 24 955 30 10 07 23.0 16 03 44 10 07 46.79 16 09 03.0 April 21 9 09 00 9 37 41.8 12 29 07 9 38 11.70 12 20 29.4 5 18 Leonis. "The positions are referred to the mean equinox of Jan. 1st, 1848. "This comet is remarkable for the length of time during which it |