182 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Death of—Cont’d. 
J. C. Riley.iii 28 
J. Rodgers.v 102 
B.F. Sands.vi 41 
G. C. ShaefFer. i 90 
W. J. Twining.v 102 
J. J. Woodward. .vii 72, 75 
M. Yarnall.iii 28 
Declination standards.ix 53 
Deep sea mollusks.v 90 
Definitions. vii 46 
Degradation. See Erosion. 
Delgarno, G., cited on instruction of the 
dumb. vi 71 
Delta of the Mississippi river.i (10) 
Democritus’ philosophy.vii xxxiv 
Denihilo nihil fit .vii xxx, xxxiii 
Denver, Altitude of.ii 24 
Department of science.ix xlvi 
Depauperation of Limmea.iii 75 
Derham, Dr. W., cited on echoes.v 41 
De Tocqueville, cited on destruction of In¬ 
dians.ii 175 
Device for viewing the sun by light of any 
desired wave length.x 13 
Devonian strata near Sulphur Springs, W. 
Va. ii (27) 
Dewar, Prof., cited on the radiometer.ii 81 
Diagnosis of blood-stains.ii 20, 41 
Diarrhceal diseases and weather.iv 165 
Diatonic scale.vii 26 
Differential equations* admitting periodic 
integrals.x 100 
Diffraction fringes.iii 119 
phenomena in the field of the micro¬ 
scope .ii 60 
Diller, J. S., communication on the volcanic 
sand which fell at Unalashka October 
20,1883, and some considerations con¬ 
cerning its composition. Ahstract..'xx\ 33 
topaz from Stoneham, Maine. Abstract 
and reference . viii 5 
the geology of northern California. Ab¬ 
stract . ix 4 
the latest volcanic eruption in northern 
California and its peculiar lava. Refer¬ 
ence . ix 46 
Mount Shasta contrasted with Mount 
Rainier. No abstract . x 11 
remarks on geology of Cascade Moun¬ 
tains . ix 8 
Krakatoan dust. vii 35 
Diorthode . vi 123 
Diptheria, Inoculation of.. iv 38 
Direction of sound. Determination of. iii 69, 
viii 12, ix 43 
Page. 
Discontinuity in elliptic orbits. vii 122 
Discovery of the satellites of Mars. ii 186 
Disease and climate. iv 165 
Conservative element in. ii ill, 124 
Disinfection by gases. iv 38 
of ships. iii 51 
Dismal Swamp, Geology of..... vi 28 
Displacement, Geologic. ii 75 
of the middle Atlantic slope.x 16 
Dissipation of energy. vii 63 
Distances on any spheroid. viii 52 
Distribution of fossil plants. x 28 
mammals. ii 26 
scientific men and institutions.x 7 
the surplus money of the United States 
among the States. vi 103 
District of Columbia; Flora of. iv 64 
Diurnal variation of magnetic declination, 
iii 46 
Dixwell, G. B., communication on cylinder 
condensation, steam jackets, and su¬ 
perheated steam. Title only..., .ii 64 
Doane, G. C , report of the Yellowstone ex¬ 
pedition of 1870. Communicated by S. 
F. Baird. Referenee .i 21 
Dobson, Surgeon-Major, cited on insectivor¬ 
ous mammals .....v 118,120 
Dog, Malformed.ii 185 
Doolittle, M. H., communication on the neb¬ 
ular hypothesis and the inner moon 
of Mars. Abstract .ii 188,190 
the infiuence of aerolites on planetary 
motion. Abstract .ii 190 
aerolithic disturbance of planetary mo¬ 
tions. Abstract.. .ii 190 
a pile of balls. Abstract .iii 76 
the silver question. Abstract .iii 103,112 
the geometrical problem to determine a 
circle equally distant from four points. 
Abstract .v 88 
substance, matter, motion, and force. 
Title only ...vi 14 
infinite and infinitesimal quantities. 
Abstract . vi 133 
the rejection of doubtful observations. 
Abstract .vi 152 
music and the chemical elements. 
Abstract .vii 26, 27 
the verification of predictions. Ab¬ 
stract .vii 122 
cause and chance in the concurrence of 
phenomena. Title only .viii 54 
What is topography ? Abstract .,..x 14 
Newton’s vis. Title only .x 38 
association ratios. Abstract .x 83 
a problem in probabilities. A6s^mc^...x 88 
