PUBLICATIONS OF 



B. SYSTEMATIC LIST OF TITLES. 



MATHEMATICS. 



80. Alvord. — The Tangencies of Circles and of Spheres. By 

 Benjamin Alvord, Major XL S. Army. January, 1856. 4to. pp. 

 16, and 9 plates. (S. C. viii.) Price 50 cents. 



ASTRONOMY. 



8. Down 3S. — Occultations visible in the United States during 

 the year 1848. Computed under the direction of the Smithsonian 

 Institution. By John Downes. 1848. 4to. pp. 12. 



9. Downes. — Occultations visible in the United States during 

 the year 1849. Computed under the direction, and at the expense 

 of the Smithsonian Institution. By John Downes. 1848. 4to. 

 pp. 24. 



10. Downes. — Occultations visible in the United States during 

 the year 1850. Computed by John Downes, at the expense of the 

 fund appropriated by Congress for a Nautical Almanac, and pub- 

 lished by the Smithsonian Institution. 1849. 4to. pp. 26. 



These three papers by Mr. Downes were not published in 

 the series of Contributions. 



11. Downes. — Occultations visible in the United States during 

 the year 1851. Computed by John Downes, at the expense of the 

 fund appropriated by Congress for the establishment of a Nautical 

 Almanac, and published by the Smithsonian Institution. Oct. 1850. 

 4to. pp. 26. (S. C. ii.) Price 20 cents. 



29. Downes. — Occultations visible in the United States during 

 the year 1852. Computed by John Downes, at the expense of the 

 fund appropriated by Congress for the establishment of a Nautical 

 Almanac, and published by the Smithsonian Institution. 1S52. 

 4to. pp. 34. fS. C. in.) Price 20 cents. 



