118 
PHILOSOPHICAL SOCIETY OP WASHINGTON. 
Page. 
Acoustics, List of papers on—Continued, 
the telephote. E. B. Elliott. Abstract. l92 
musical intervals. E. B. Elliott. Ab¬ 
stract . il 199 
binaural audition. A. G. Bell. Abstraet..iil 68,69 
the spectrophone. A. G. Bell, In full. 
Plate .iv 142 
upon a modification of Wheatstone’s mi¬ 
crophone and its applicability to radio- 
phonic researches. A. G. Bell. In full. 
Plate .Iv 183 
recent investigations by the Light House 
Board on the anomalies of sound from 
fog-signals. A. B. Johnson. In full. 
2 maps, 1 figure .v 23 
anomalies of sound signals. J. C. Welling. 
In full .V 39 
the difficulty in determining the direction 
of sound, A.B. Johnson. AbstracL.vliill, 12 
the mechanism of “clicks” and “clucks.” 
A. G. Bell. Title only .viii 18 
Action at a distance.v 156 
Adams, Prof. Carl, cited on Malfatti’s prob¬ 
lem . 11 118 
^dam.s, Prof, W. G., cited on electric resist¬ 
ance.Iv 154 
\ddress of chairman of Mathematical Sec¬ 
tion .vl 117 
of President Henry, 1871.1 v, 34 
Henry, 1875. 11 60 
Henry, 1877 . 11 162 
Newcomb, 1879.Ill 52 
Newcomb, 1880. Iv 40 
Woodward, 1881.v 49 
Taylor, 1882..,..v 126 
Powell, 1883.vl xxvii, 110 
Welling, 1884.vll xxix, 81 
Hall, 1885. vlll xxxiii, 30 
Billings, 1886 .lx xxxv, 46 
Harkness, 1887.x xxxvii, 39 
of retiring president. Resolution concern¬ 
ing.Iv 30 
on the life and character of Joseph Henry, 
11 203, 368, 370 
Adhesion and cohesion.v 136 
Adirondack region. Proposed reservoirs in 
the. 11 67, 82 
Adjustment of conditioned observations,vlll 41 
of the calendar. 11 59 
Administration of scientific work.lx xliii 
Adulteration of food.Iv 39 
Aerolite. See Meteor. 
Agassiz, Louis, Announcement of death of..l 93 
Resolutions on death of...... 1 95 
Agricola, Georg, cited on mineralogy. 1 77 
Ague, Conservative function of.vl 5 
Page. 
Air, Contamination of.iv .37 
Alaska, Discoveries in.Iv 163 
Glaciation in.vl 33, x 15 
Results of travels in. 1 22 
Value to the United States of. 1 25 
Alaska-Siberia boundary.Iv 123 
Albertype process of photo-engraving. 1 42 
Aleutian Islands, Shell heaps of.. 11 65 
Alexander, Stephen, communcation on the 
zodiacal light. Read by J. E. Hilgard. 
In full, 9 figures . 1 105, (19) 
Algebra, Logical. 1 88 
Algorithm of the .arithmetico-geometric 
mean.vll 102 
Alignment curves on any surface.vl 123 
Allard, M. E., cited on the light-house service 
of the United States.Iv 138 
Alluvial basin of the Mississippi. 1 (10) 
Alphabet, Phonetic. lx 17 
Altitude of the Caspian and Aral seas. 11 34 
Altitudes deduced from combination of rail¬ 
road levellings. 11 23 
Alvord, Benjamin, cited on gravitation form¬ 
ula.vlll 40 
communication on the habitability of the 
elevated plateaus of the west. Title 
only . 1 74 
the recent earthquakes in North Caro¬ 
lina. Abstract . 1 101 
the mortality among army officers. Ref¬ 
erence . 11 49 
proposed governmental insurance. No 
abstract . 11 49 
a trigonometrical formula. Title only...\.i 104 
the intersection of circles and the inter¬ 
section of spheres. Title only . 11 198 
new points respecting the intersections 
of circles and the intersections of 
spheres. Title only . 11 201 
life and work of Joseph Henry. In 
full . 11 370 
a curious fallacy as to the theory of grav¬ 
itation. Infull .V 85 
some of the properties of Steiner’s power 
circle. Title only .v 89 
the compass plant. Reference .v 106 
a special case in maxima and minima. 
Abstract . 
149 
Death of.. 
.... vll 72, 
127 
List of mathematical papers by... 
128 
Memorial to. 
127 
remarks on Lake Bonneville. 
.11 
103 
Benjamin Peirce. 
..Iv 23, 
24 
Arkansas bonds.. 
105 
agricultural colleges. 
106 
Amendment to constitution. 
...lx 47, X 
39 
