OF THE SMITHSONIAN INSTITUTION. 43 



236. Circular Relative to Heights. By Joseph Henry. 1871. 8vo.,pp. 



2. (M. C. X.) 



237. Directions for constructing Lightning Rods. By Joseph Henky. 

 . 1871. 8vo., pp. 4. (M. C. X.) 



238. List of the Institutions, Libraries, Colleges, and other Establishments 



iu the United States in correspondence with the Smithsonian Institu- 

 tion. By Wm. J. Rhees. July, 1872. 8vo., pp. 256. (M. C. x. ) 



239. Observations on Terrestrial Magnetism, and on the Deviations of the 



Compasses of the United States Iron Clad Mouaduock during her 

 cruise from Philadelphia to San Francisco, in 1865 and 1866. By 

 Wm. Harkness. 1872. 4to., pp. 226, 2 woodcuts. (S. C. xviii.) 



240. Problems of Rotary Motion presented by the Gyroscope, The Pre- 

 cession of the Equinoxes, and The Pendulum. By J. G. Barnard. 

 1872. 4to., pp. 56, 6 woodcuts. (S. C. xix.) 



241. A Contribution to the History of the Fresh Water Algre of North 



America. By Horatio C. Wood, Jr. 1872. 4to., pp. 272, 21 

 plates of 340 figures. (S. C. xix.) 



242. Lucernarise and their Allies. A Memoir on the Anatomy and Physi- 

 ology of Haliclystus Auricula and other Luceruariaus, with a Dis- 

 cussion of their Relations to other Acalephse, to Beroids and Polypi. 

 By H. J. Clark. 1878. 4to., pp. 138, 11 plates of 149 figures. 

 (S. C. xxii.) 



243. List of Foreign Correspondents of the Smithsonian Institution ; cor- 

 rected to January, 1872. 1872. 8vo., pp. 66. (M. C. x.) 



244. Annual Report of the Board of Regents of the Smithsonian Institu- 

 tion, for the year 1870. 42d Congress, 1st Session. House of Rep- 

 resentatives, Ex. Doc. No. 20. 1871. 8vo., pp. 494, 28 woodcuts. 



CONTENTS. 



Henry, J. Secretary's report of oporiitions. 



Board of Hegents, Proceedings of 



List of meteorological stations and observers. 



List of meteorological material contributed to Smithsonian Institution. 



Henry, J. Eulogy on Alexander Dallas Bache. 



Baohe, a. D. Lecture on Switzerland. 



Henry', J. On a physical observatory. 



Akago, M. The History of my Youth, an autobiography. 



Arago, M. Eulogy on Herschel. 



Life and labors of Henry Gustavus Magnus. 



Anderson, M. B. Life of Prof. Chester Dewey. 



Taylor, W. B. Thoughts on the nature and origin of force. 



