C.

Caliciaceæ, Fr., 198, 269.

Calicium, gen., Pers., 198, 270.
brunneolum, Fr., 272.

chrysocephalum, Turn., 272.
curtum, Turn., 270.
hyperellum, Wahl., 271.
lenticulare, Ach., 270.

melanophæum, Ach., 272.

phæocephalum, Turn., 272.
phæomelanum, Tuckerm., 271.
subtile, Pers., 271.

trachelinum, Ach., 271. ·

trichiale, Ach., 271.

turbinatum, Pers., 273.

viride, Pers., 270.

Canal from Atlantic to Pacific Ocean, 184.

Cartilagineæ, Fr., 206.

Cetraria, gen., Ach., 197, 205.

aculeata, Fr., 206.

aurescens, Tuckerm., 208.

ciliaris, Ach., 208.

cucullata, Ach., 207.

glauca, Ach., 207.

Islandica, Ach., 206.

juniperina, Ach., 209.

lacunosa, Ach., 208.

nivalis, Ach., 207.

Oakesiana, Tuckerm., 209.

odontella, Ach., 206.

pinastri, Sommerf., 209.

placorodia, Tuckerm., 208.

Richardsonii, Hook., 206.

sepincola, Ach., 207.
tristis, Fr., 206.

viridis, Schwein., 209.

Chinese language, 45, 51.
Citrinæ, Fr., 222.

Cladonia, gen., Hoffm., 198, 239.
alcicornis, Fr., 239.

amaurocræa, Floerk., 245.
bellidiflora, Schær., 247.
Boryi, Tuckerm., 246.
Botrytis, Hoffm., 245.

cæspiticia, Floerk., 240.
carneola, Fr., 244.

cenotea, Schær., 243.

cornucopioides, Fr., 246.

cornuta, Fr., 242.

decorticata, Floerk., 242.

deformis, Hoffm., 248.

degenerans, Floerk., 241.

Despreauxii, Bory., 245.
digitata, Hoffm., 248.
fimbriata, Fr., 242.

Floerkiana, Fr., 247.

furcata, Floerk., 243.
gracilis, Fr., 241.

Hookeri, Tuckerm., 247.

macilenta, Hoffm., 247.

Papillaria, Hoffm., 240.

parasitica, Schær., 243.

pyxidata, Fr., 240.

rangiferina, Hoffm., 244.

squamosa, Hoffm., 243.

sulphurina, Michx., 248.
turgida, Hoffm., 240.
uncialis, Fr., 245.

Clytemnestra, gen., Dana, 154.

scutellata, D., 154.

Cocciferæ, Fr., 246.

Collema, gen., Hoffm., 281.

fasciculare, Ach., 282.

flaccidum, Ach., 283.

granulatum, Hook., 282.

melænum, Ach., 282.

nigrescens, Ach., 283.

Collema palmatum, Ach., 283.

plicatile, Ach., 281.

pulchellum, Ach., 283.

pulposum, Ach., 281.

pustulatum, Ach., 282.

saturninum, Ach., 284.
tenax, Ach., 282.

tunæforme, Ach., 283.

Collemaceæ, 281.

Collemeæ, 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.

Liebig, J., 163, 302.

Mitchell, William, 329.

Nichol, J. P., 300.

Owen, Richard, 178.

Paine, Mr., 300.

Peirce, Benjamin, 36, 39, 41, 57, 65, 144, 185, 285, 286, 295, 300,

305, 331, 332, 338.

Schumacher, H. C., 301.

Strong, Theodore, 129.

Sullivant, William S., 35.

Teschemacher, J. E., 179.
Tuckerman, Edward, 195.
Walker, Sears C., 146, 285, 331.

White, Daniel A., 38.

Williams, John B., 158.

Wyman, Morrill, 185, 307.

Compositæ, new, from Texas, 46.

Coniocybe, gen., Fr., 198, 273.

nigricans, Fr., 273.

Conotrema, gen., Tuckerm., 199, 278.

urceolatum, Tuckerm., 278.

Cornicularia, Fr., 201.

Corticolæ, 259, 279.

Crustacea of the United States Exploring Expedition, 149.

Cyclopidæ, fam., 150.

Cyclops, gen., 150.

Brasiliensis, Dana, 150.

curticaudus, D., 151.

MacLeayi, D., 151.

pubescens, D., 151.

Vitiensis, D., 152.

Cyprinoids, distinctive characters of the family, 342.

D.

DANA, JAMES D. Crustacea of the United States Exploring Expedi-

tion, 149.

Donations to the Library, 3, 36, 42, 155, 181, 343.

Dufourea, Fr., 203.

E.

Eclipse, solar, of May, 1845, 19. Of April, 1846, 20.
EMERSON, GEORGE B. Report on phonotypy, 23.

Endocarpaceæ, Fr., 199, 274.

Endocarpon, gen., Hedw., 199, 274.

fluviatile, DC., 275.

lætevirens, Turn., 275.

miniatum, Ach., 274.

Muhlenbergii, Ach., 275.

pusillum, Hedw., 275.

Ephebe, gen., Fr., 281, 284.

pubescens, Fr., 285.

Ephebideæ, 281, 284.

Ether, inhalation of, 39, 56.

Eulogy on Hon. John Pickering, 38.

EVERETT, EDWARD.

On the number of supposable undiscovered