Völkelianus, Karsch, 14, 17.
Antiphytum, 265.

Antirrhinum subcordatum, 306.
Aphyllon Cooperi, 307.
Aplopappus Orcuttii, 297.
Apparatus, self-recording, 453.
Arabis retrofracta, 353.
subpinnatifida, 353.
Arachnida, paleozoic, a contribution
to our knowledge of, 13.
Araneæ, 13, 22.

Architarboida, Karsch, 14, 16.
Architarbus, Scudder, 14, 17.

rotundatus, Scudder, 14, 17.
silesiacus, Roemer, 14, 17.
subovalis, Woodward, 14, 17.

Arenaria Howellii, 354.
Aristolochia subclausa, 372.
Arizona, California, and their Mexi-
can borders, new genera of,
and two additional Asclepia-
daceæ, 290.

Arthrolycosa, Harger, 15.

antiqua, Harger, 15.

Arthrolycosidæ, Harger, 15.
Asbestos filter, 390.

Asclepiadaceæ, two additional gen-
era of, 290, 294, 295.

Astacus Colchicus, 158.
Dauricus, 151.

fluviatilis, 155.

Gambelii, 152.

Japonicus, 149.

Klamathensis, 151.

leniusculus, 151.

leptodactylus, 157.

nigrescens, 152.
pachypus, 158.

pallipes, 154.
Schrenckii, 151.
torrentium, 153.
Trowbridgii, 152.

Astacus and Cambarus, descriptions
of new species of, to which is
added a synonymical list of the
known species, 107.

Astacus, list of the known species of
Cambarus and, 135.

Astragalus acutirostris, 360.
castaneæformis, 361.
Congdoni, 360.
fallax, 362.
Fendleri, 362.

Communications,—
Alexander Agassiz, 23.
W. G. Farlow, 311.
Walter Faxon, 107.
Asa Gray, 1, 8, 257.
F. A. Gooch, 390, 435.
C. Loring Jackson, 163.
Jules Marcou, 174.
Alexander McAdie, 448.
Austin L. McRae, 448, 462.
Charles Bingham Penrose, 417.
Edward C. Pickering, 393, 407.
William H. Pickering, 159, 473,
478, 483.

Jacob Reighard, 88.
W. A. Rogers, 379.
Samuel Scudder, 13, 167.
John Trowbridge, 462, 494.
Sereno Watson, 324.

A. G. Webster, 490.
C. O. Whitman, 23, 76.
Convolvulus pentapetaloides, L., 305.
Cowania Havardi, 364.
Cristaria, 356.

Cuphea glutinosa, Cham. & Schlecht.,
365.

Croton Pringlei, 373.

Curculioides Ansticii, Buckl., 17.
Prestvicii, Buckl., 19.
Cyclophthalmus, Corda, 22.

senior, Corda, 14, 22.
Cymopterus alpinus, 369.
bipinnatus, 368.

foeniculaceus, 369.
Cynoglossum, Tourn., 258.

D.

Dalea canescens, 359.

megacarpa, 359.

Orcuttii, 359.

rubescens, Watson, 360.

Desmodium Arizonicum, 363.

Dicliptera pseudoverticillaris, 308.

resupinata, Juss., 308.
Torreyi, 309.

Dictyoneura and the allied insects of

the carboniferous epoch, 167.

Dictyoneura, Gold., 168, 169.
affinis, 170.

Humboldtiana, Gold., 170.
Schmitzii, Gold., 170.
sinuosa, Kliv., 170.

Draba Howellii, 354.

Dry plates, photographic, a method
of measuring the absolute sen-
sitiveness of, 159.

E.

Echidiocarya, 286.
Arizonica, 286.

Echinoglochin, Gray, 259.
Echinospermum, Lehm., 258.
Electric potential of the upper air, on
obtaining the, 459.

Electricity, atmospheric, 448.
Electrometer, multiple quadrant, 451.
Electrometers, 448.
Ellisia Torreyi, 302.

Emmons, E., letters, 184, 186, 198,
189, 190.

Energy, superficial, and thermo-elec-
tricity, relation between, 417.
surface, two ways of considering,

417.

between two media, 421.
Eophrynoidæ, Karsch, 14, 18.

Eophrynus, Woodward, 19.

Prestvicii, Woodward, 14, 19.
Salmi, Stur, 19.

Eoscorpionidæ, 21.

Eoscorpius, Meek and Worthen, 21.

anglicus, Woodward, 14, 22.
carbonarius, Meek and Worthen,
14, 21.

euglyptus, Peach, 22.

glaber, Peach, 22.

inflatus, Peach, 22.

tuberculatus, Peach, 22.

Erigeron nudatus, 297.

Eriogonum arborescens, Greene, 371.

corymbosum, 371.

foliosum, 371.

giganteum, 371.

gracile, 372.

hirtiflorum, Gray, 370.

Orcuttianum, 371.

suffruticosum, 370.

vagans, 370.

Eritrichium, Schrad., 260.
Euphorbia Rattani, 372.

Eureka quartzite, 231, 233, 234,
235.

Eustis, Henry Lawrence, notice of,

513.

Exposers, photographic, methods of
determining the speed of, 478.

Fellows, Associate, deceased: -
Alpheus S. Packard, 505.
Benjamin Silliman, 513.
Fellows, Associate, elected : —
Cleveland Abbe, 506.

Albert A. Michelson, 508.
Fellows, Associate, List of, 544.
Fellows deceased :·

Samuel Cabot, 511.

George B. Dixwell, 511.

Henry L. Eustis, 513.
Robert W. Hooper, 511.
Edward Jarvis, 506.

Fellows elected:

William Morris Davis, 506.
William Leslie Hooper, 506.
Alonzo Smith Kimball, 501.
Augustus Lowell, 511.

Edward Laurens Mark, 506.
Lewis Mills Norton, 511.
Benjamin Osgood Peirce, 506.
Denman Waldo Ross, 508.
Edwin Forrest Sawyer, 511.
Harold Whiting, 506.

Fellows, List of, 541.

Filter, anthracene, 391, 392.

asbestos, 390.

Filtration by means of easily soluble
and easily volatile filters, a
method of, 390.

Fish eggs, pelagic, on the develop-
ment of some, 23.

Foreign Honorary Members de-
ceased:

George Bentham, 505.
Karl R. Lepsius, 505.
Mark Pattison, 505.

Carl T. E. von Siebold, 511.