170 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Social Science and Statistics, List of 
papers on—Cont’d. 
statistics of the Philosophical Society from 
its foundation. G. K. Gilbert. Ab¬ 
stract . X 29 
the progress of science as exemplified in 
the art of weighing and measuring. 
W. Harkness. In full .x xxxvii, 39 
association ratios. M. H. Doolittle. Ab¬ 
stract . X 83 
association ratios. M. H. Doolittle. Ab¬ 
stract . X 94 
Societies, American scientific.viii xxxiii 
Scientific.i vi 
and Professor Baird.x 45 
Statistics of...x 29 
Soils and sewage.iv 38 
Solar corona. i 31, lii 110,121 
eclipse, Jan. 11,1880.iii 121 
July 29, 1878.ii 202, iii 116 
heat variations and climate.vi 10 
parallax derived from transit of Venus, 
1874. iv 168 
from the velocity of light.iii 74 
methods.v 39 
Solid, liquid, and gas defined.v 136 
SomofF’s theorem.ix 54 
Sondhauss, cited on refraction of sound....ii 57 
Sorghum sugar.iii 140 
Soul.V 103 
Sound, Abnormal phenomena of.ii 37 
and fog signals.ii 57, 60, (45), iv 135, v 23, 39 
heat.iv 143,183 
light.iv 143 
Determination of direction of...iii 69, viii 12 
from two syrens.ii 85 
Joseph Henry’s researches on.ii 344 
Refraction of.ii 57,167, (48), v 35, 39, 44 
velocity and air temperature.vi 47 
waves and earthquake waves.ix 42, 43 
(See also Acoustics.) 
Sounds accompanying and following meteor 
of December 24,1873.ii 157 
South Mountain fault.vi 30 
Space.vii 56 
Resisting medium in.i 34, 39 
Temperature of..ii 73 
Space-directed lines.x 105,106 
Sparrows, English.x 16 
Specific gravity method.vi 26 
Spectrophone.iv 143,161 
Spectrum of Encke’s comet.i 34 
corona.iii 117 
Speech, Visible.iv 55, vi 60 
Speed of propagation of the Charleston 
earthquake....x 17, 28 
Page. 
Spencer, Herbert, cited on ceremonies. ix 20 
growth of crystals. v 67 
motion. vii 57 
nerve currents. v 62, 
the ultimate.v 164,166 
Spheres, Problem concerning. v 107 
Spheroid, Distances on any.... viii 52. 
SpofFord, A. R., communication on proposed 
reforms in spelling the English lan¬ 
guage. Title only .ii 42 
Spontaneous generation. ii 109, 64,103 
Standard for micrometiy. iii 22 
Standard time. ii 137, 202, vi 106 
adopted by the society. vii IS 
A system of. v 112 
Standards of declination... ix 53 
length... ii 136 
value. iii 78,107 
Standing rules of the General Committee, i 
xvii, ii vi, iii vi, 149, iv 11, v 11, vi xii, 
vii xii, viii xii. ix xii, x xii 
Standing rules of the Mathematical Section, 
vi 115, vii 85, viii 35, ix 51, x 81 
Standing rules of the Society..i xvi. ii iv, iii 
iv, 149, iv 7, 30, 38, v 7, vi ix, vii ix, 
viii ix, ix ix, x ix 
Star catalogue prepared at U. S. Naval Ob¬ 
servatory .i 74 
New.ix 14 
Stars, Arrangement of.iii 76 
Images of.ix 15 
Station errors.ii 82 
Statistics. (See Social Science.) 
Steam as a disinfectant. iii 51 
Steiner, Prof. J., cited on Malfatti’s problem, 
ii 115 
on Feuerbach’s circle.viii 46 
Stellar photometry. i 63 
Steno, cited on crystallography.i 77 
Sternberg, Dr. G. M., Researches on Bacillus 
malarise. iv 39 
Stokes, Professor, cited on refraction of 
sound....ii 58, (47), v 40 
Stone, Ormond, communication on the de¬ 
termination of the errors of a pro¬ 
visory catalogue of fundamental stars. 
Title only .i 62 
the correction of a comet’s orbit. Refer¬ 
ence . ii 22 
a problem in probabilities. Abstract....-s. 89 
the orbit of Hyperion. Abstract and ref¬ 
erence .X 104 
Stoneham, Me., Topaz from.viii 5 
Stoney, cited on the radiometer.ii 81 
Storage of electric energy.v 46 
Storm centres. Movement of.i 99. 
