160 
PHILOSOPHICAL SOCIETY OP WASHINGTON. 
Page. 
Necks of volcanoes. vll 78 
Nerve currents.v 60 
Nev6 and glacier defined.vll 37 
Nevada, Glacial epoch in.1 84 
Physical features of.1 54 
Volcanic activity in.1 99 
New Hampshire, Relation of winds to sea 
temperature on the coast of..11 17 
New Mexican volcanoes and lava-fields...vll 76 
New star.lx 14 
Newberry, Dr. J. S., cited on fossil plants 
from Virginia.11 (38), (42) 
Newcomb, Simon, communication on the 
transits of Venus, past and future. 
Title only .1 29 
the possibility of a universal atmos¬ 
phere. Title only .1 .52 
the progress of the construction of the 
new telescope for the Naval Observa¬ 
tory. Reference .1 62, 63 
the proceedings of the commission to 
arrange for the observation of the next 
transit of Venus. Title only .i 65 
the mechanical representation of a 
problem in least squares. Referenee.X 89 
the transit of Venus. Title only .11 41 
a thermodynamic theory of the spec¬ 
trum. Title only. .Ill 41, 43 
the cosmogony. Title only .11113 
the recent transit of Mercury [1878]. 
Abstract .11 199 
observations of the total solar eclipse, 
July 29, 1878. Abstract .11 202 
the recurrence of eclipses. Title only. .iil 33 
a recent visit to California to inspect a 
site for the new Lick observatory. 
Title only .Ill 45 
the future of the human race regarded 
from the standpoint of evolution. 
Presidential address, 1879. Title only. .Hi 52 
the principles of taxation. Title only, 
111 119 
the relation of scientific method to so¬ 
cial progress. Presidential address, 1880. 
In full .iv 40 
the speed of propagation of the Charles¬ 
ton earthquake. Reference .x 28 
remarks on auroras.1 46 
the radiometer.11 81 
passage of light through a narrow slit, 
ill 120 
auroras.tv 22 
Benjamin Peirce....iv 26 
Newton, Henry, Researches in the Black 
Hills by.ill 125 
Newton, Prof. H. A., cited on the aurora...lv 22 
Page. 
Newton, Sir Is.aac, cited on action at a dis¬ 
tance. V 159 
. atoms...vll xliv 
elasticity.v 130 
laws of orbits...v 146 
the spectrum.v 142 
the ultimate.v 165,167 
trisection of angles.x 97 
Newton’s rings.v 155 
Newtonian formula of gravitation. Modifica¬ 
tion of..viii 39 
philosophy..vll 45 
Niagara Falls, Earth tremors at.Iv 186 
Nichol, J. P., Thermometric experiments 
of.. V 93 
Nicholson, W. L., report of the committee 
to collect information relative to the 
meteor of December 24th, 1873. In full. 
Map and 2 figures .ii 139 
remarks on the effect of magnetism on 
the length of magnetic bars.il 373 
Nomogram.x 4 
Normal section in geodesy..vi 123 
North American Indians, Errors respecting, 
ii 175 
North Carolina coast. Geology of..vi 28 
earthquakes. i 101,104 
mica mines.vii 9 
thermal belts. vi 11 
waterspouts.ii 104 
Northers and magnetic disturbance.vii 25 
Nth.power numbers whose sum is an nth- 
power... X 107 
Numas, Genesis and demonology of.i 104 
Mythology of..i 96 
Nymphalidse, Pupation of...iii 41 
Objective, Interior angle of.iii 19 
Achromatic.iii 65 
Objectives, Color corrections to achromatic, 
iii 39 
Oil-immersion.iii 25 
Oblateness of the earth. Change in.viii 19 
Oblique illumination in microscopy.iii 25 
Observation and experimentation. Princi¬ 
ples of..ii 163, vii li 
Observation equations, Special treatment of 
certain.vi 156, viii 41 
Observations of the meteor of Dec. 24,1873..ii 144 
Occult force.:.vi xxxiii 
qualities.v 126 
Oceanograpliy, List of papers on ; 
on the effects of winds' and barometric 
pressure on the tides of Boston, and 
on the mean level of the sea. W. Fer- 
rel. Abstract and reference .1 53 
