Allorchestes, gen., Dana, 205.

australis, D., 206.

brevicornis, D., 207.

compressa, D., 205.

gracilis, D., 205.

graminea, D., 208.

hirtipalma, D., 205.
humilis, D., 206.

intrepida, D., 207.

Novi-Zealandia, D., 207.

orientalis, D., 207.

Peruviana, D., 206.

verticillata, D., 205.

Alloys, analysis of, 195.
Altona Observatory, 146.

Amphitoë, gen., 213.

brevipes, D., 216.

fissicauda, D., 214.
fucorum, D., 216.
inæquistylis, D., 214.
Indica, D., 215.

peculans, D., 213.

peregrina, D., 216.

Peruviana, D., 215.

pubescens, D., 214.

rubella, D., 215.

tenuicornis, D., 215.

Tongensis, D., 216.

Anæsthetic agents, 148.

Aneroid barometer, 186.

Angles, trisection of, 146.

Annual meetings, 1, 158, 231, 266.

Anonaceæ, new genus of, 325.

Antaria, gen., 39.

crassimana, D., 39.

gracilis, D., 40.

obtusa, D., 40.

Apatite, 242.

Argulidæ, fam., 53.

Argyroxiphium, gen., 159.

macrocephalum, Gray, 160.

Asteroids, model of, 305.

Astrangia Danæ, 162.

Astridium, gen., Dana, 61.

orientale, D., 61.

Athenæum, Boston, room in, for the Academy, 301.

Aurora, connection of, with atmospheric electricity, 283.
Aztec children, 245.

B.

Barometer, Aneroid, 186.

Barometrical scales, 237, 243.

BOND, G. P. On Saturn's rings, 264. On two of the inner satellites
of Saturn, 304.

BOND, W. C. On Mauvais's comet, 1. On an eighth satellite of Sat-
urn, 4, 139. On the satellite of Neptune, 136. On Encke's
comet, 138. On Petersen's second comet, 140. Moon culmina-
tions observed at Cambridge, 141. Double stars observed at Cam-
bridge, 144.

Bone corpuscles, 257.

Bonito, on the scales of, 238.

Bosminidæ, fam., 47.

Boston Harbor, deterioration of, 261, 288.

Boundary between United States and Canada, 105.

BOWDITCH, H. I. On the animals and vegetable products found in the

Calanus, appressus, D., 17.

arcuicornis, D., 12.

attenuatus, D., 18.

bellus, D., 18.

communis, D., 17.

comptus, D., 11.

cornutas, D., 19.

crassus, D., 12.

curtus, D., 13.

elongatus, D., 18.
flavipes, D., 15.
furcicaudus, D., 12.
gracilis, D., 18.
inauritus, D., 16.
levis, D., 14.

Magellanicus, D., 12.

medius, D., 14.

mundus, D., 16.

nudus, D., 11.
pavo, D., 13.

pellucidus, D., 15.

placidus, D., 14.

recticornis, D., 14.

rostrifrons, D., 19.

rotundatus, D., 11.

sanguineus, D., 16.

scutellatus, D., 13.

setuligerus, D., 15.

simplicicaudus, D., 16.

stylifer, D., 13.

tenuicornis, D., 15.

turbinatus, D., 12.

Caligacea, 53.

Caligeria, gen., Dana, 57.

bella, D., 57.

Caligidæ, fam., 53, 54.

Caligina, Dana, 54, 55.

Caligus, gen., 55.

Bagri, D., 57.

Caligus, gracilis, D., 56.
productus, D., 56.

Thymni, D., 56.

Calistes, gen., Dana, 57.

Trigonis, D., 57.

Candace, gen., Dana, 5, 22.

aucta, D., 24.

curta, D., 23.

Ethiopica, D., 23.

ornata, D., 23.

pachydactyla, D., 23.

truncata, D., 24.

Catopia, gen., 10, 25.

furcata, D., 25.

Cecropina, Dana, 54.

Cells, forming entire animals, 236.

Cetacea, fossil, of United States, 4.
Chagres, longitude of, 162.

CHANNING, W. F. Electrical phenomena during the aurora of Sep-
tember 29th, 283. On tornadoes, 290. On the electric fire tele-
graph, 299.

Charcoal, low point of ignition, 256.

Chart, old, of the mounds at Marietta, 220.

Cladocera, 47.

Clio, planet, 257.

Clydonia, gen., Dana, 219.

gracilis, D., 219.

longipes, D., 219.

Coast Marks, 111, 123, 184, 221, 225.

Coast Survey, Report on, 124.

Coats that form on lead, 92.

Cochituate water, its action on lead pipes, 65, 75, 79, 99.

Coloration of animals, 234.

Comet, discovery of a new, 110.

Comet, Encke's, 138.

Comet, Petersen's second, 140, 147.

Comet of Mauvais, 1.

Comet of April and May, 1849, 149, 158.

Comets, parts of our solar system, 147.

COMMUNICATIONS from

Abbot, J. H., 252, 265, 285, 292.

Agassiz, L., 2, 4, 136, 148, 158, 162, 180, 181, 183, 234, 236, 237,

238, 244, 262, 264, 269, 270, 323.

Alger, Francis, 246, 263.

American Association for the Advancement of Science, 163.