INDEX TO VOLUMES I-xX. 
Page. 
Hall, Asaph, communication on—Cont’d. 
the method adopted in writing the in- 
ternational scientific telegrams, Ab- 
BUTCCE scvcandsvcenesscncure peebad aaaacdvonsswans serra i 101 
the operations of the several parties sent 
from the United States to observe the 
transit of Venus on the 8th of Decem- 
Gry USTAS -ADStract..ovcccccceseteses scuase 4i 31, 32 
approximate quadratures. Abstract, 
ii 48 
the appearance of Saturn’s rings. Ab- 
StTACT «2.200 CUnSE Ene eO-EeD Conc ebenspes maces ii 94 
a bright spot which has recently become 
visible on the ball of Saturn. Ab- 
the position of the centre of gravity of 
the apparent disk of a planet. Refer- 
IRE Baek ces ce caskecasdeties Biaeeamtsyescscscrnsnsscshs li 181 
the results of a search for satellites of 
Mars. Abstract and reference..........+ ii 186 
the supposed discovery of a trans-Nep- 
tunian planet at the U. S. Naval Ob- 
servatory in 1850. Abstract............ iii 20 
the satellites of Saturn. Abstract....... did 26 
the orbits of ‘Titan and Hyperion. Ab- 
BUNA iaec-ayeeet teecte cuss datovesceccrscuscecceus .- did 40 
inaugural address as chairman of the 
Mathematical Section. Jn full........ vi 117 
the determination of the mass of a 
planet from observation of two satel- 
Lites. ADSEraCL...:c..c0c0ce0n0s Saancceedne oe WA 132 
the formule for computing the position 
of asatellite. In full. 1 figure......vwid 93 
American scientific societies. Presiden- 
tial address. In full...........0 viil xxxili, 30 
variations of latitude. Abstract and ref- 
ETENCE....00r0000e wepssenessenen pap emaest iahuseaeons viii 10 
the new star in the nebula of Andro- 
MNGWAs” ESELONCE cea. cacessecvccessseasceseons ix 14 
the images of stars. Reference............ ix 15 
a problem in probabilites. Read by G. 
EAT be) NO AD SEN ACE, <issccs seveaceos ssbiuss x 88 
the parallax of a Tauri. Abstract....... .x 91 
Euler’s theorem (generally called Lam- 
bert’s). Abstract.............. ecksnneshGaicies x 101 
Longitude of Plover Bay by.......... iv 124, 126 
remarks on planetary motions...ii 188, 189, 192 
transit of Mercury............. Stes sacee seaetenks ii 199 
criteria for the rejection of observa- 
GROFIT S seteet aes Sis cruncel conus tecceesascaeiet scores wi 155 
Grassmann’s geometry... 
time determinations...............68 Eenite 
Hall, G. S,, communication on mene expe- 
riments on reaction time and the time 
BOUSGs8 eM VOLC IOV acsccccvtoceanadscdesenens viii 4 
Haller, A. von, cited on nerve currents.....v 61 
56 
145 
Page. 
Hallowell, Benjamin, letter on the meteor 
of December 24, 1873. Communicated 
by J. Henry. No abstract......10.seceseees 4 95 
Halo, A remarkable solar.........ccscccssssecsesees v 112 
Hamilton, Sir W., cited on ultimate causes, 
v 163, 166 
Harkness, William, communication on the 
physical constitution of the corona of 
GHG! SUM MTPEfENENCE.ct 22.0) savarsdccubecescctde i 31 
the spectrum of Encke’s comet. Refer- 
ONCE canoaicateubsnpenterancusenees paepelist a acsens baat i 34 
the spectrum of Encke’s comet, and the 
appearance of Tuttle’s comet. Refer- 
OMCO ss ciecatnseucsentacennsans weadenbienveeaansewentey i 34 
the density of the hypothetical resisting 
medium in space. Title and refer- 
OME GretNastness want aboe tiees.sensovounseccoccsauaussnvesces i 39 
some measurements of heights by a 
pocket aneroid. Title onlt/...cecceseseeee. i 64 
the power necessary to drive the pendu- 
lum of an astronomical clock. Title 
ONY se.neeee Roesacen Atvetncete tara STEPS Se tet eseeteseuene i 74 
the distribution of temperature over the 
surface of the globe. Reference.........4 96 
the apparatus to be used in the observa- 
tions of the approaching transit of 
Venues, TRIE ON Ys... cseveatt vecccvesesetros i 102 
the transit of Venus in 1874. Communi- 
cated by A. Hall. Abstract.......cccccooe ii 32 
the methods of measuring the inequali- 
ties of the pivcts of the transit instru- 
MENG, CLELE OIG. ws ccnssnsonscnsacuccdavecsets li 68 
the voyage of the U.S. S. Swatara. Wo 
CLOSET GCE, <cstuecuassccnnnescasacetsssss-cueup senses 41 68, 69 
the velocity of light and determination 
of the solar parallax. Title only........ ii 201 
the color corrections of achromatic ob- 
jectives. ADStract.........ccc0csevencess iii 39 
the number of lenses required in an 
. achromatic objective, consisting of in- 
finitely thin lenses in contact, in order 
that, with any given law of dispersion 
whatever, the greatest possible num- 
ber of light-rays of different degrees 
of refrangibility may be brought to a 
common focus. Jn full......... acbaeeict iii 65 
the solar corona. Abstract.......s0......4id 116 
the relative accuracy of different meth- 
ods of determining the solar parallax. 
REFERENCE cnvencecves caoasteehasic>hasaésnudespantine v 39 
the monochromatic aberration of the 
human eye in aphakia. Reference, 
wi 5 
flexures of transit instruments. Ab- 
BUUTCheccccatsespsnesshasbecuntenanen wceeveusessss WOE / 27 
