IV PUBLICATIONS OF 



49. Notice of some recent additions to our knowledge of the magnetism 

 of the United States and its vicinity. Am. Jour. (2), vol. 4, pp. 192-198. 

 September, 1847. 



50. Elements of geometry and conic sections. 8vo, pp. 222. New York, 

 1847. 



51. Notice of a water-spout. Am. Jour. (2), vol. 4, pp. 362-364. No- 

 vember, 1847. 



52. Keport on the meteorology of the United States, submitted to the 

 Secretary of the Smithsonian Institution. Sen. Doc. No. 23, 30th Congress, 

 first session, pp. 193-207. Ordered printed January, 1848. 



53. Historical notice of the discovery of the planet Neptune. Am. Jour. 

 (2), vol. 5, pp. 187-205. March, 1848. 



54. Note respecting Halley's comet. Am. Jour. (2), vol. 5, pp. 370-372. 

 May, 1848. 



55. The relations of Neptune to Uranus. Am. Jour. (2), vol. 5, pp. 435- 

 437. May, 1848. 



56. Elements of plane and spherical trigonometry,' with their applications 

 to mensuration, surveying, and navigation. 8vo, pp. vi, 148. New York, 

 1848. 



57. Tables of logarithms of numbers and of lines and tangents for every 

 ten seconds of the quadrant, with other useful tables. 8vo, pp. xvi, 150. 

 New York, 1848. 



58. On the determination of the difference of longitude by means of the 

 magnetic telegraph. Roy. Soc. Proc, vol. 5, pp. 787-789. 1849. 



59. Experiments on the electricity of a plate of zinc buried in the earth. 

 Am. Jour. (2), vfl. 9, pp. 1-11. January, 1850. (Am. Assoc. Proc, pp. 

 196-200, 1849. Bibl. Univ., Archives, vol. 13, pp. 265-281.) 



60. On the longitude of Hudson (Ohio) Observatory. Astron. Jour., Nos. 

 8 and 9. May, 1850. 



61. On the proper height of lightning rods. Am. Jour. (2), vol. 10, pp. 

 320-321. (Read August, 1850.) (Am. Assoc. Proc, pp. 38-43. 1850.) 



62. On the electrical phenomena of certain houses. Am. Jour. (2), vol. 

 10, pp. 321-323. (Read August, 1850.) (Am. Assoc Proc, -pip. 12-15, 1850. 

 Edin. New Phil. Jour., vol. 50, pp. 225-227.) 



63. On optical moving figures. Am. Assoc. Proc, pp. 293-295. 1850. 



64. The recent progress of astronomy, especially in the United States. 

 8vo, pp. 257. New York, 1850. 



65. Elements of analytical geometry and of the differential and integral 

 calculus. 8vo, pp. 278. New York, 1851. 



66. On Kirkwood's law of the rotation of the primary planets. Am. Jour. 

 (2), vol. 11, pp. 217-223. March, 1851. 



