4. Pickering, Edward C., Parkhurst, J. A., Aitken, Robert G., Curtis, Heber D., Mitchell, S. A., Alden, Harold L., Simpson, T. McN., and Reed, F. W.—Photometric Magnitudes of Faint Standard Stars, measured visually at Harvard, Yerkes, Lick and McCormick Observatories, pp. 209–307. 9 pls. August, 1923. $6.00. 5. Thaxter, R.—Contribution towards a Monograph of the Laboulbeniaceæ. Part III. pp. 309–426. 12 pls. $6.00. =Vol. 15.= 1. Jeffrey, E. C.—The Origin and Organization of Coal. pp. 1–52. 13 pls. November 1924. $3.00. 2. Mills, Hiram F.—Flow of Water In Pipes. (With a historical and personal note by John R. Freeman and introductory outline by Karl R. Kennison). pp. 55–236. Portrait. 6 Figs. November, 1924. $7.50 3. Fernald, M. L.—Persistence of Plants in Unglaciated Areas of Boreal America. pp. 237–342. 73 maps. June 1925. $5.00. PROCEEDINGS. Vols. 1–60, $5 each. Discount to booksellers and Libraries 25%; to Fellows 50%, or for whole sets 60%. The individual articles may be obtained separately. A price list of recent articles is printed on the inside pages of the cover of the Proceedings. * * * * * Complete Works of Count Rumford. 4 vols., $5.00 each. Memoir of Sir Benjamin Thompson, Count Rumford, with Notices of his Daughter. By George E. Ellis. $5.00. Complete sets of the Life and Works of Rumford. 5 vols., $25.00; to Fellows, $5.00. For sale at the Library of THE AMERICAN ACADEMY OF ARTS AND SCIENCES, 28 Newbury Street, Boston, Massachusetts. ------------------------------------------------------------------------ TRANSCRIBER’S NOTES ● Typos fixed; non-standard spelling and dialect retained. ● Used numbers for footnotes ● Enclosed italics font in _underscores_. ● Enclosed bold font in =equals=. ● Subscripts are shown using an underscore (_) with curly braces { }, as in H_{2}O.