132 
Page 
Death of—Cont’d. 
J.C. Riley...... Soswernrdvephiacawensensautsew cress iid 28 
J. Rodgers....... Ridteshctss savece cesetsasted -v 102 
BP UNSRMGS Gitta rectsesescvescaceserscencncsunccouss vi 41 
G. C. Shaeffer.............. serebadeessh. (00. 
We aU Estes stzsessscccesscoccccnmscsanahsean'® AUm 
J. J. Woodward....... oe recc o vesconas WAL 12, 75 
M. Yarnall...... pac astven saenalccaeaage eiudcvecenae Ait 28 
Declination standards....... audeevespenasteneeass=h ix 53 
Deep sea mollusks.........eeeee © eecemns Jotecenae v 90 
MD GHIUCLON Sseseececuce sar cceeesscabieccorshcpsoanpeeencans Eo AG 
Degradation. See Erosion. 
Delgarno, G., cited on instruction of the 
UID is eates-sstuaeas eeeconsen eedeeered pidetecatenc® wa UL 
Delta of the Mississippi river.......... macesceces i (10) 
Democritus’ philosophy........... careereee Vil xxxiv 
De nihilo nihil fit.....00..cceeee canst «Vii xxx, xxxili 
Denver, Altitude of........ Peteescratstcuntcaseaeecavan ih 24 
Department Of SCIONCE......00.cesseereeceeeee dX XIVI 
Depauperation of Limnea........ necétincteecoa iid 75 
Derham, Dr. W., cited on echoes..........-seee v 41 
De Tocqueville, cited on destruction of In- 
IANS eektens eter rcecssaceeeces cee tes consepanescacnecs Ad 175 
Device for viewing the sun by light of any 
desired wave length......... cebnereseeserstes x’ 13 
Devonian strata near Sulphur Springs, W. 
Wiciiec tonacheceunacerencstraneryseanacantsn SU eereccee ii (27) 
Dewar, Prof., cited on the radiometev....... ii 81 
Diagnosis of bDlOOG-StAiNS......cecrereeeseers ii 20, 41 
Diarrheal diseases and weather.............. iv 165 
DistOMie SCA]? crise sccacessrececbcocecnccwcee eneaeas vii 26 
Differential equations admitting periodic 
AWCCE TAS: «ress ssscncccesessecse Beeeeneee cocoon x 100 
Diffraction fringes..u.....)sececcesocveseccecen sehaic iii 119 
phenomena in the field of the micro- 
ROO errr cessesoceccsvcssdssacralceessiepeecsco ss ese ii 60 
Diller, J.S., communication on the volcanic 
sand which fell at Unalashka October 
20, 1883, and some considerations con- 
cerning its composition. Abstract..wii 33 
topaz from Stoneham, Maine. Abstract 
LUE MEP OTENCCwtsaunentenen vecece crasnccssaasece viii 5 
the geology of northern California: Ab- 
SUL ACU veccecees Rae anostantanausacesetercatenesm ae oe 
the latest Shiai eruption in northern 
California and its peculiar lava. Refer- 
ONCEu. ccksucensceecctracsvaswecesedseuse Sstragiceecreen ix 46 
Mount Shasta contrasted with Mount 
Rainier. Wo adstract..........00esseeeeceees c peap til 
remarks on geology of Cascade Moun- 
GALA eoudsautccuvcuvaetsearevsusarcteucacaceeeencces ix 8 
Krakatoan dust........... 
DiOrtEROMS ciscsvseesess sss0~pevecdsdeen 
Diptheria, Fuatalation Ob yekssectasotes canes ored: 
Direction of sound, Determination of......ili 69, 
wiil 12, ix 43 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Discontinuity in elliptig orbits......+0..... Wil 122 
Discovery of the satellites of Mars.......... if 186 
Disease and climate..............00+ Greco SP 
Conservative slement in.............00000 41 111, 124 
Disinfection by gases...........cc00+ wsnansae aoa iv 38 
OL SNIPE, cess, s0ccersensstaceasnceceen daswossavaesauerss Ramen 
Dismal Swamp, Geology Ofv.eccceseseesecereeeWh 28 
Displacement, Geologic.............0 eacuccnsuceatt i 75 
of the middle Atlantic slope.... 
Dissipation of energy..........cceceee 
Distances on any spheroid....... 
Distribution of fossil plants............cc000 
TOSINMIEIS veces cccusctvesssvcsencnecetnreenne rpescri: ii 26 
scientific men and institutions...........% 7 
the surplus money of the United States 
AMONG the States.....cccccccocorsseees wee WA 103 
District of Columbia, Flora of... 
Diurnal variation of magnetic ‘dealinattans 
iii 46 
Dixwell, G. B., communication on cylinder 
condensation, steam jackets, and su- 
perheated steam. Title only............ ii 64 
Doane, G. C., report of the Yellowstone ex- 
pedition of 1870. Communicated by S. 
F. Baird. Reference.........s000. Rereeernaccce) 2! 
Dobson, Surgeon-Major, cited on insectivor- 
ous mammals ........ ‘v 118, 120 
Dog, Malformed..............sccs0 oacocctnteneeenn weed 185 
Doolittle, M. H., communication on the neb- 
ular hypothesis and the inner moon 
Peete eee ence serene 
of Mars.. “Abstract... ssssseces esseeeeK 188, 190 
the influence of aerolites on planetary 
Motion. AOstACL..:225ossccnecsseeteeesestenee ii 190 
aerolithic disturbance of planetary mo- 
tions. Abstract............ eve nuchvaninvuan ners ii 190 
a pile of balls. Abstract...........0000 w-. ddd 76 
the silver question. Abstract....... iii 103, 112 
the geometrical problem to determinea 
circle equally distant from four points. 
ADSITGCE. <0, cstesess occsceasduceessd stiunoneeabeate v 88 
substance, matter, motion, and force. 
PUtle ONY sccen sccccttsessaectepeseinten den peneees WhO 
infinite and infinitesimal quantities. 
ADSENGCES.ccossces aesstenecerenenee oteaa te eaten wi 133 
the rejection of doubtful observations, 
A GSU ACES. «conccoscactunse o seseneesussameennn Ruane wi 152 
music and the chemical elements. 
ABSIT ECE. conncecses eescanee saere aanvaceouceeene vii 26, 27 
the verification of predictions. Ab- 
SUT ACE ccecns Le waneeieeaasee seceeeeWAk 122 
cause and chance in the concurrence of 
phenomena. Title only.......... seo Wild 54 
What is topography? Abstract............ x i4 
Newton’s vis. Title only,........0000+ Mae chest 
association ratios. Abstr@wt........ beancenteakt nee 
a problem in probabilities. Abstract...x 88 
