A.

Abutilon aurantiacum, 357.
Berlandieri, Gray, 358.
Lemmoni, 357.
Parishii, 357.
Wrightii, 357.

Acalypha mollis, HBK., 373.
Pringlei, 373.

vagans, 373.

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.

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.

Alabamensis, 125, 146.

Alleni, 110, 138.
angustatus, 137.

argillicola, 115, 144.

Bartonii, 142.

Blandingii, 135.

Carolinus, 140.

Clarkii, 136.

compressus, 127, 146.

cornutus, 120, 145.

Cubensis, 142.

Diogenes, 144.

dubius, 114, 145.

extraneus, 145.

fallax, 136.

forceps, 133, 148.

Girardianus, 117, 145.

gracilis, 141.

hamulatus, 145.

Harrisonii, 130, 147.

Hayi, 108, 136.

immunis, 146.

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.

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.

of measuring the absolute sen-
sitiveness of, 159.

Echidiocarya, 286.

E.

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, 188,
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.

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.

involved in the construction
of, 483.

(1.) Position of the exposer, 483.
(2.) Construction of the exposer,

484.

(3.) Shape of the aperture in the
exposer, 484.

(4.) Motive power, 488.
Exposures, instantaneous, apparatus
for measuring, 480.

F.

Faunæ, Infra-Primordial, Primordial,
and Supra-Primordial, 228,

255.

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.