164 
Page. 
Burnett, S. M.: communication on Refraction 
in the principal meridians of a triaxial 
ellipsoid ; regular astigmatism and cylin- 
drical lenses......... Se kaanihaVacasessatsenaatitha sh bee . 4 
_—-- The character of the focal 
lines in astigmatism ..... sone scouenen awaceeeee tans 45 
Calendar, Perpetual ............scscccccssecenssenecceees 135 
Cambrian system, The, in the United States’. 
PVE OMMNACA sc scscavccuvssenesiversstdscsesdascseaaeeate - 98 
Cape Hatteras, Geology Of..c.....ce-ccecceseeeeceenes 28 
Certain possible abbreviations in the com- 
putation of the long-period perturbations 
of the moon’s motion due to the direct 
action of the planets........ ......+ Dewekuctnsess 136 
Chamberlin,T. C., Election to membershipof, 36 
Character of the focal lines in astigmatism., 45 
Chemistry (See Explosive Eruption, Specijic 
Gravity.) 
Chickering, J. W.: communication on The 
thermal belts of North Carolina..........4 rel 
Christie, A. 8.: communication on A quasi 
general differentiation. ............:0-ssccecerees 122 
--—-- Contact of plane curves......... 157 
— — —: remarks on infinitesimals.............. 135 
Clarke, F. W.: remarks on volcanic ex- 
PIGSIOUS revvactadussnascwasVencstesecencterserastee tees 93 
Climate, Response of, to variations in solar 
ALA DION oe stevecacs coer een tacteceestenesacresasense asain 10 
Coal, Origin of........ meenintescssecennd ioe sapetenereresses - 28 
Committee, Auditing, Appointment of.......... 111 
—— —— EUODOE U Of ccc cseveccesss3 ssenadvavevrssssdorersesenpces 5 
—, General, Constitution and duties of the.. vii 
ix, xX, xi 
— —, Members of the ......... cece ceeeee coer xiv, XV 
— on Communications, Constitution and 
GUTIOSTOL UNG .srsecteeccecx ecsacnessees seseeeceeeantes xii 
— — —, Members of the ...........c eee eeeees Xiv, XV 
— — Publications, Constitution and duties 
OT TAG: vy, Se St eeveiet es cecheeancne vancutoteceammee xii, xiii 
— — —, Members of the..............2cceeeeee AP. h ae.a 4 
Committees on Mathematical Papers...... 135, 161 
Computation, Least-square..........cccesseseeeeene 150 
— of lunar perturbations 
GONSUIGUTION! 3.0 c0.cceccesecvet coupeusencaecustuectace castes 
Contact of plane’ CUrVvesi.scccsuveccctssecrcsesvucceecute 
Correlation of Cambrian groups .............c000 98 
GOFTISONG A. sce cccecsvencstedesacssacssesanepdes sarasnseesresee 162 
Crane, CoH Deathioris cisswrcccasccerseteatenes . Xiy, 41 
Criteria for the rejection of observations...... 155 
Crova'sihy grom eters: secessessasceys fecneeeatweterecesee 36 
Cultivation of the eucalyptus on the Roman 
CaMPAR DA sseiacosscasssducecasteasceterousautsecst cere 36 
Curtis; Josiah Death Ofi-c.r..ctanesereserereetee acces 41 
Curves; Alignmenti.oc3i.c2:cie vccthecstacesestese scares 123 
—, Contact of....... =cotecrer ceeercrt: otrecree Besereneenee 157 
Cutts, R. D.: communication on The action 
of the International Geodetic Association 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
as to an initial meridian and universal 
time ..... panecuavahapd pasddss'sseccunvcacnceuneaauenaeen soae) oO 
me a my DORE Off .ccs cdececsoccscsocnecanscentensnuteets 111 
Dalgarno, George: cited on communication 
With MUGS. 06.05 <cnseccascsusesscesssnassieeemeenneee 71 
Dall, W. H., Announcement by.............00seee08 5 
—-—-—: communication on glaciation in 
AlagSkG sivcccevese acvae cid saadedaces oseapeeanee bgeananes Bess 
— — —: remarks on glaciers and solar heat, 11 
Darwin's theory of the distribution of vol- 
CATLOCS {civic cacssenscenastachenceceeataeee anes asa 89, 91 
Deaf, Fallacies concerning the.............08 heaved Ga 
Denudation and volcanism...........cssccseceee ee 
Deposition of ore by replacement ............ 32 
Determination of the mass of a planet from 
observations of two satellites ................. 132 
— — — specific gravity of solids by the 
common hydrometer........... isecasdeesteaatenae 26 
Determining the temperature of the air, 24, 46, 47 
Differentials: defined ........<..001sccnsncsdrancvaeeeees . 134 
Differentiation, A quasi general................00 . 122 
Diorthode, The............ svudvenssencphensdueeeenanee -. 123 
Dismal Swamp........... seeabsbusoseanceduenaeheeeanne . 28, 30 
Distribution of the surplus money of the 
United States among the States.......... - 103 
— — volcanoes.......... Seusdaassessaenadecpatsdeateaeee 87 
Doolittle, M. H.: communication on Infinite 
and infinitesimal quantities.. ............0000 133 
—--—-- Substance, matter, motion, and 
FOL COs sscisire sce oesewns ducewsdsacuscastectestntreeenaeee 14 
---- The rejection of doubtful ob- 
SOLVAtlONS!... .casdeccaccs ssdcnssvevaceastseeeeneee dereos AOD 
— — —: remarks on binary arithmetic........ 39 
Doubtful observations, Rejection of.......... eos 152 
Drainage, system, The, and the distribution 
of the loess in eastern Iowa..............02000 93 
Dreams in their relation with psychology.... 37 
Driftless region, Loess of the.............sse0000 96 
Dumbness, Fallacies concerning 
Dunes)of, North Carolina :..2..scessccsesdesteteeeeten 
Dutton, C. E.: communication entitled The 
volcanic problem stated...........s00ss008 ccnseeaenn 
— — — —on the Geology of the Hawaiian 
Tan dS s.scsctuss.cccecsshvcsccercsencusedeneentacenenenme Pa 
— — —: exhibition of views of the Hawaiian 
Tslan ds, vccccccscstcceeevesteves ceamte Prreerrr cers: = LO) 
— — —: remarks on determining the tem- 
perature! of the air.:.:;.cvssieveneleereeeeae ausse ee 
—--—--—-— Ennis’ hypothesis 
—--—--—-— the separation of minerals by 
GONSIY’ ...:ccecescacvaccuecoscccescescenteeeesseeenenne <7 a 
Dynamic hypothesis, The, controverted..... xxx 
Easter, Formulas for the computation of...... 15 
Eastman, J. R.: communication on The Flor- 
ida expedition for observation of the 
transit Of VeNUS........0ccesesees od evonse edu ea 
