Acerates bifida, Rusby, 296.

Ecidium columnare, 322.

pseudo-columnare, 322.

Air, upper, on obtaining the electric

potential of the, 459.

Aluminum, on the separation of tita-
nium and, with a note on the
separation of titanium and iron,
435.

Angelica Dawsoni, 369.

Anoplocaryum, Ledeb., 261.

Anthracene filter, 391, 392.

Anthracomarti, Karsch, 13, 14, 15.

Anthracomartus, Karsch, 14, 17.
Krejcii, 17.

pustulatus, 18.
trilobitus, 17.

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.

Architarboidæ, 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.
gracilentus, 363.
Greenei, Gray, 363.
Mohavensis, 361.
Orcuttianus, 361.
procumbens, 361.

troglodytus, 362.

Cambarus pellucidus, 139.
penicillatus, 138.
propinquus, 147.
pubescens, 109, 137.
Putnami, 131, 148.
robustus, 143.
rusticus, 148.
Sanbornii, 128, 147.
Shufeldtii, 134, 149.
simulans, 112, 140.
Sloanii, 147.

spiculifer, 138.

spinosus, 148.

troglodytes, 136.

Uhleri, 116, 145.

versutus, 138.
virilis, 147.

Wiegmanni, 138.

Cambarus and Astacus, list of the

known species of, 135.

Cambarus, descriptions of new species
of; to which is added a syno-
nymical list of the known
species of Cambarus and Asta-
cus, 107.

Camphor, method for the preparation
of borneol from, 165.

Camphor to borneol, on the reduction
of, 163.

Carum Gairdneri, 368.

Oreganum, 368.

Cassiope oxycoccoides, 300.
Cedronella breviflora, 309.

cana, Hook., 310.
pallida, Lindl., 310.
Cerastium sericeum, 354.
Cereus giganteus, 368.
Pringlei, 368.

Chænactis Parishii, 299.

suffrutescens, Gray, 299.

Chrysomyxa, 320, 322.

Ledi, 320, 321, 322.

Rhododendri, 320.

Chrysomyxa of the United States,

notes on some species of Gym-
nosporangium and, 311.

Cimicifuga Arizonica, 352.

elata, 352, 353.

laciniata, 352.

Cobalt, the effect of temperature on

the magnetic permeability of
iron and, 462.

dimensions of the rings, 465.
shielding of magnetic influence,

471.
tables, 465-470.

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.

Croton Pringlei, 373.

Cuphea glutinosa, Cham. & Schlecht.,
365.

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

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

fœniculaceus, 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.

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.
Eophrynoida, Karsch, 14, 18.

Eophrynus, Woodward, 19.

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

Eoscorpionidae, 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.

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.