146 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Harkness, William, communication on—Cont’d. 
the progress of science as exemplified 
in the art of weighing and measuring. 
Presidential address. In fuU....JC xxxvii, 39 
a device for viewing the sun by light of 
any desired wave length. Abstract...Ji 13 
the representation of comet orbits by 
models. Reference . x 28 
the constant P in observations of terres¬ 
trial magnetism. x 102 
remarks on the black drop. ii 199 
results from photographs of the transit 
of Venus.iv 169 
vital force..v 105 
temperature observations.vi 26 
hygrometry.vi 36 
postulated continents.vi' 93 
accidental and constant errors.vi 133 
glaciers.vii 9 
vision.vii 13 
problem in probabilities.x 89 
Harper’s Ferry, Fault near ..vi 30 
Hart, A. S., cited on Malfatti’s problem..ii 117,119 
Harting, cited on mineral aggregates.iii 39 
Hartley, J., Solution of a geometrical prob¬ 
lem by..j. iii 61 
Hatteras, Geology of Cape.vi 28 
Hausen, C. A., cited on nerve currents.v 60 
Hauy, cited on mineralogy.i 77, 78 
Havana magnetic disturbance and north¬ 
ers .vii 25 
Hawaiian geology. vi 13 
Hayden, Everett, communication on the 
Charleston earthquake. Abstract, 
Map . ix 38 
Hayden, F. V., cited on base-line methods..iii 34 
Hazen, H. A., communication on the retarda¬ 
tion of storm centres at elevated sta¬ 
tions and high wind as a probable 
cause. In full .v 108 
the coming winter of 1882-’83. Ab¬ 
stract .V 122 
hygrometric observations. Abstract...-\-i. 36 
thermometer exposure. Abstract .,vi 46 
the sun glows. Abstract and reference..-vii 17 
thermometer exposure. Abstract .vii 80 
thunderstorms of 1884. Abstract .viii 10 
the condensing hygrometer and sling 
psychrometer. Abstract .viii 25 
effects of solar radiation upon thermom¬ 
eter bulbs having different metallic 
Coverings. Abstract .ix 33 
the sky glows of 1883, Title only .x 6 
relation between wind velocity and 
pressure. Reference .x 10 
remarks on deflection of rivers.vii 24 
Page. 
Hazen, H. A., remarks on—Cont’d. 
weather prediction. viii 9 
care of pamphlets. viii 29 
graphics.x 5 
wind vanes .x 9 
the sparrow question. x 16 
Hazen, W. B., bibliography of meteorology 
X 21 
Death of.x 6 
Heat of the sun.i 31 
Theory of.v 133 
Heats, Molecular.i 104 
Hell Gate explosion.viii 28 
Hellmann, Dr. G., bibliographic work in 
meteorology.x 20, 21, 23, 25 
Helmert cited on alignment curves....vi 124,126 
Henrj’’, Joseph, Address on the life and char¬ 
acter of.ii 203, 368, 370 
cited on a telephonic experiment.ii 104 
adhesion and cohesion.v 137 
land and sea breezes..,v 29 
sound anomalies.ii 58, iv 135, v 33, 40, 43 
the Philosophical Society.x 45 
Washington as a scientific center.x 47 
communication on phenomena of sound 
and experiments with tuning forks. 
Title only . i 22 
observations made on a journey to Cali¬ 
fornia. Title only . i 31 
the organization and objects of the So¬ 
ciety. Presidential address. In full, 
i V, 34 
, the life and scientific labors of the late 
Alexander Dallas Bache. Reference...i. 35 
the expenditure of the income of the 
Bache fund for 1872. Title only .i 53 
the fluctuations of the river Nile. Title 
only .i 63 
the condition of the Society. No ab¬ 
stract ..i 64 
sound in relation to fog-signals, from in¬ 
vestigations under the direction of the 
U. S. Light House Board. In full .i 65, 
ii (45) 
atmospheric electricity. Title only....\ 75, 87 
experiments on fog signals during the 
past summer. Title only .i 90 
a method of developing magnetism in 
bars of steel. Title only .i 97 
meteor trains, and the upper atmos¬ 
pheric currents. Title only .i 98 
GifFard’s injector. Title only .i 99 
audition. Title only .ii 22 
the glacial theory. Abstract .....ii 35 
fog signals and abnormal conditions of 
sound. Reference .ii 37 
