INDEX. 351 



CoUema palmatum, Ach., 283. 

 plicatile, Ach., 281. 

 pulchellum, Ach., 283. 

 pulposum, Ach., 281. 

 pustulatum, Ach., 282. 

 saturninum, Ach., 284. 

 tenax, Ach., 282. 

 tunseforme, Ach., 283. 

 Collemaceae, 281. 

 CoUeme^, Fr., 281. 



Comet, direct computation of the orbit of, 332. 

 Comet, De Vico's fourth, 39. 

 Comet of De Faye, 297. 

 Comet of Lexell, 296. 

 Comet of March 4th, 1847, 69. 

 Comet of Mauvais, 169. 

 Comet of Miss Mitchell, 183. 

 Comets of 1845 and 1846, 17. 

 Comets, telescopic, medal for discovery of, 301. 

 Communications from 



Agassiz, Louis, 43, 180, 342. 



Andrews, S. P., 45, 51. 



Bigelow, Henry J., 39. 



Bigelow, Jacob, 184. 



Bond, G. P., 300, 326, 332, 342. 



Bond, W. C, 5, 14, 17, 19, 20, 21, 50, 69, 70, 103, 110, 165, 168, 



169, 170, 175, 182, 184, 325, 327. 

 Caswell, J., 56. 

 Dana, James D., 149. 

 Emerson, George B., 23. 

 Everett, Edward, 1, 164, 178, 296, 301. 

 Gillis, Lieutenant, 300. 

 Gould, B. A., Jr., 305. 

 Gray, Asa, 46. 

 Henry, Joseph, 168. 

 Horsford, E. N., 302. 

 Hunt, J. C, 44. 

 Jackson, C. T., 43, 56. 

 •Leverrier, M., 163, 296. 



