ACADEMY OF SCIENCES.] ASTRONOMY. 41 



139. On the motion of Hyperion — a new case in celestial mechanics. 



Astr. Papers, vol. 3, 1891, pt. 3 (1S84): 345-371. 



140. Report to the Secretary of the Navy on recent improvements in astronomical instruments. 



Washington, Govt, print, off., 1884, 27 pp. 



Reprinted, in part, under the title: (1) " Astronomical clocks," in Sid. Mess., vol. 3 (1884): 200-208; (2) " New method of mount- 

 ing reflectors." in Science, vol. 3 (Mar. 14, 1889): 320-321; (3) "The great Vienna telescope," Science, vol. 3 (Mar. 28, 18S4): 

 380-384. 



141. Questions respecting Mi - . Stone's theory of changes in the mean solar day. 



Mo. Notices R. Astr. Soc, vol. 44 (Mar., 1884): 234-235. 



142. Remarks on the value of the secular acceleration of the moon's motion derived from 



observation. 

 Mo. Notices R. Astr. Soc., vol. 44 (Mar., 1S84): 236-237. 



143. Recent determinations of stellar parallax. 



Science, Cambridge, vol. 3 (Apr. 11, 1884): 456-457. 



144. Note on Mr. Stone's explanation of the error of Hansen's lunar tables. 



Mo. Notices R. Astr. Soc, vol. 44 (June 13, 1884): 381-383. 



This article is followed in the same issue by "Answers to Prof. Newcomb's questions on the changes in the adopted unit of 

 mean time," by E. J. Stone. 



145. Sur le mouvement d'Hyperion. 



Comptes Rcndus, vol. 99 (Sept. 22, 1884): 499-502. 



146. Remarks on the theory of the relations between the mean motions of the planets. 



Astr. Nach., vol. 110 (Sept. 29, 1884): cols. 1-1. 



147. Measures of the velocity of light, made under direction of the Secretary of the Navy 



during the years 1880-82. 

 Astr. Fapers, vol. 2, 1891, pt. 3 (1885): 107-230+7 plates. "Introduction" reprinted in Sid. Mess., 

 vol. 5 (Jan. and Feb., 1886): 15-18, 68-73. 

 Immediately following this memoir, in the same volume of Astr. Papers, was A. A. Michelson's memoir "Supplementary 

 measures of the velocities of white and colored light in air, water, and carbon disulphide." with an "Introductory note" 

 (p. 235) by Simon Newcomb. 



148. On the proposed change of the astronomical day. 



Mo. Notices R. Astr. Soc, vol. 45 (Jan. 9, 1885): 122-123. 



491. The Lick Observatory of California. 



Harper's Mag., vol. 70 (Feb., 1885): 399-406. 

 150. [Letter in appendix tp a "Report of the Committee of the American Meteorological Society 

 on Standard Time"]. 

 Proc. Amer. Meteorological Society, New York, vol. 5 (May, 1885): 57-62. 

 Letter dated Dec. 6, 1884, and addressed to W. E. Chandler, Secretary of the Navy. 



151-152. (1) [Remarks on the proposed change of the astronomical day]; (2) [Remarks on 

 the progress of work on the planetary theories.] 



Vierteljahrsschrift der Astr. Gesell., vol. 20 (Oct., 1885): 228-229, 236-237. 



153. [Letter to President F. A. P. Barnard, chairman of the committee of the National Academy 



of Sciences, replying to his inquiries about conditions at the U. S. Naval Observatory, 

 in the appendix of the report of the National Academy of Sciences to the Secretary 

 of the Navy on the advisability of building a new Naval Observatory.] 

 Washington, Govt, print, off., Feb. 10, 1886. Senate, 49th Congress, 1st session. 

 Executive Document No. 67. Letter dated Washington, D. C, November 17, 1885. 



154. Popular astronomy. 



Science, New York, vol. 7 (Apr. 30, 1886): 392. 



Letter concerning similarity of passages in R. S. Ball's The Story oft he Heavens on the one hand, and the previously published 

 Young's The Sun. and Newcomb's Popular Astronomy on the other. 



155. Red sunsets and volcanic eruptions. 



Nature, London, vol. 34 (Aug. 12, 1886): 340. 



156. Alvan Clark. 



Nation, New York, vol. 45 (Aug. 25, 1887): 149-150. 

 Anonymous editorial. 



157. The place of astronomy among the sciences — an address delivered at the dedication of the 



new observatory of the University of Syracuse, N. Y., Nov. 18, 1887. 

 Sid. Mess., vol. 7 (Jan., 1888): 14-20; (Feb., 1888): 65-73. 



