148 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Hilgard, J. E., remarks on—Cont’d. 
persistent observation of phenomena..!! 19 
vocabularies.!! 28 
calendar reform.!! 30 
photographs of the sun.!! 33 
cause of glacial climate.!! 36 
a new meteorological instrument.!! 64 
Dakota calendar..!! 92 
Peirce’s Linear Associative Algebra...!v 24 
unification of longitudes and time.v! 109 
Hilgard, Theodore, communication on the 
number of the cephalic vertebrae. 
Reference .! 26 
Hill, G. W., communication on certain pos¬ 
sible abbreviations in the computation 
of the long-period perturbations of 
the moon’s motion due to the direct 
action of the planets. Abstract and 
reference .v! 136 
a formula for the length of a seconds- 
pendulum. Reference . .v!! 101 
a problem in probabilities. Abstract...x. 88 
the motion of Hyperion. Abstract and " 
reference . x 90 
the integration of differential equations 
admitting periodic integrals. Abstract 
and reference. . x 100 
remarks on infinitesimals...v! 135 
gravitation formula.v!i! 40 
adjustment of conditioned observations, 
v!i! 41 
Grassmann’s geometry.v!!! 53 
density of Mercury..v!!! 45 
problem in probabilities.x 89 
electric currents. . .x 93 
Hill, M., cited on visible speech.v! 78, 80 
Hill, R.T., communication on the topography 
and geology of the Cross Timbers of 
Texas. Read by W J McGee. Reference, 
X 6 
Hillhouse, Dr. William, cited on trisection of 
angles. x 99 
Hind, cited on supposed trans-Neptunian 
planet.!!! 20 
Historical note on binocular microscopes, 
!v 35 
on the method of least squares.! 62 
History of a geometrical problem..!!! 64 
Malfatti’s problem.!! 113 
Hitchcock, Romyn, communication on re¬ 
cent improvements in microscopic ob¬ 
jectives, with demonstration of the 
resolving power of a new l-16th inch. 
Title only .!x 16 
Hoffman, Dr. A. W., cited on ultimate 
causes.v 166 
Pago. 
Hoffman, W. J., cited on the poisoning of 
arrows.!! 182 
communication on the use of poisoned 
arrows by North American Indians. 
Title only . .!! 183 
Holden, E. S., communication on the adopted 
value of the sun’s apparent diameter. 
In full ...! 95, (3) 
Sir William Herschel’s observations of 
the satellites of Uranus. Jn/wiL..! 106, (30) 
the number of words used in speaking 
and writing. In full .!! 28, (16) 
two drawings of nebulse, made with the 
xxvi inch telescope of the U. .S. Naval 
Observatory, by Mr. L. Trouvelot, of 
Cambridge, Mass. Abstract ...!! 51 
search for Vulcan. Abstract .!! 85 
reference catalogues of astronomical 
papers and memoirs. Abstract. .!! 95 
the shadow of the ball of Saturn pro¬ 
jected on the rings. Abstract .!! 101 
the brightness and the stellar magni¬ 
tude of I he third Saturnian satellite, 
Tethys. Read by A. N. Skinner. Title 
only .!!! 18 
B. A. Gould’s Uranometria Argentina. 
Reference . !!! 119, 122 
Holmes, W. H., remarks on glaciers. v!! 8 
Homologies of the shoulder girdle of fishes..! 64 
Homophenes.. v! 58, 76 
Hooker, Thermometric observations by...v 94 
Hooker, R., cited on natural law.v 173 
Hoosac tunnel. Acoustic features of.!! 172 
Hopkins, cited on the liquidity of the earth’s 
interior.!! 76, 78 
temperature of space.!! 73 
Hough, F. B., communication on the culti- 
, vation of Eucalyptus on the Roman 
Campagna. Reference . .v! 36 
Death of. v!!! 25 
House of Representatives, Ventilation of, 
Howland, Dr. E. P., remarks on Charleston 
earthquake. !x 42 
Hubbard, G. G., remarks on visible speech, 
v! 82 
Hughes’ microphone.!v 184 
Humboldt, Baron von, cited on transmission 
of sound.V 41 
Humidity observations.v! 36 
Humphreys, A. A., Eulogy on.-..v!! 4 
Death of.v!! 3, 4 
Humphreys and Abbot, cited on the delta 
of the Mississippi.! (10), (12), (13) 
Huron, Altitude of Lake.!! 23 
Huxley, T. H., cited on vital principle.v 78 
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