I  N  D  E  X. 
549 
De  La  Rue  {Dr.  Vv\)  oil  some  recent 
researches  in  solar  physics,  and  on 
a  law  regulating  the  time  of  dura- 
tion of  the  sun-spot  period,  385. 
Desains  (P.)  on  the  reflection  of  heat 
at  the  surface  of  polished  bodies, 
544. 
Dolbear  (Prof.  A.  E.)  on  a  new  me- 
thod of  measuring  the  velocity  of 
rotation,  398. 
Earth,  on  the  origin  of  the  magnetism 
of  the,  345,  446,  481 . 
Earth-currents,  on  testing  the  metal- 
resistance    of    telegraph-wires    or 
cables  influenced  by,  186. 
feSdhmd   (E.)   on    the    electromotive 
force  in  the  contact  of  metals,  and 
on  the  modification  of  that  force 
by  heat,  81,  213,  264. 
Electric  currents,  on  the  induction  of, 
in  an  infinite  plane  sheet  of  uni- 
form conductivity,  529. 
Electrical  machines,   on  a  collector 
for  frictional,  368. 
Electricity,  on  a  new  phenomenon  of 
phosphorescence  produced  by  fric- 
tional,  80;    on    the    passage    of, 
through  liquids,  369,  518. 
Electrodynamic    measurements,    re- 
searches on,  1,  119. 
Electrolysis,  researches  on,  369,  518. 
Electromagnets,  on   the    demagneti- 
zation of,  475. 
Electromotive    force,    researches   on 
the,  in  the  contact  of  metals,  and 
on  the  modification  of  that  force  by 
heat,  81,  213,  264. 
Erasmann   (Dr.  H.)  on  a  collector 
for  frictional   electrical   machines, 
368. 
Encke's  comet,  on  the  spectrum  of, 
380 :  on  the  telescopic  appearance 
of,  390. 
Energy,  on  the  principle  of  the  con- 
servation of,  1,  119;  on  the  dissi- 
pation of,  338,  443. 
Fluoride    of    silver,    researches    on, 
382. 
Galvanic  coils,  on  the  directive  power 
of,  in  their  action  on  external  small 
magnets,  472. 
Galvanometer,  on  the  best  resistance 
of  the    coils   of    any   differential, 
480. 
Gelatine  plates  (coloured)  as  objects 
for  the  spectroscope,  on,  240. 
Geological   Society,    proceedings   of 
the,  75,  154,  234,  314,  543. 
Gernez  (D.)  on  the  absorption- spectra 
of  chlorine  and  chloride  of  iodine, 
318;  on  the  absorption-spectra  of 
the  vapours  of  selenium,  tellurium, 
protobromide  of  iodine,  and  aliza- 
rine, 473. 
Geyer  (W.  E.)   on  a  new  sensitive 
singing-flame,  478. 
Glaciers,  on  the  mechanical  impossi- 
bility of  the  descent  of,  by  their 
weight  only,  38,  104. 
Glaisher  (J.  W.  L.)  on  certain  por- 
tions of  Laplace's  proof  of  the  me- 
thod of  least  squares,  194  j  on  the 
relations   between    the    particular 
integrals  in    Cayley's   solution   of 
Riccati's  equation,  433. 
Gordon  (J.  E.  H.)  on  a  new  anemo- 
meter for  indicating  and  registering 
the  force  and  direction  of  the  wind, 
32. 
Gore   (G.)    on    the    thermo-electric 
action  of  metals  and  liquids,  54 ; 
on  fluoride  of  silver,  382. 
Gripon  (E.)  ou  the  transverse  vibra- 
tions of  wires  and  thin  plates,  7^> 
Hall  (M.)  on  the  source  of  the  solar 
heat,  476. 
Heat,  on  the  modification  of  elec- 
tromotive force  by,  81,  213,  264  ; 
on  the  mechanical  theory  of,  106, 
338,  339,  443,  516;  on  the  disen- 
gagement of,  when  caoutchouc  is 
stretched,  157;  on  the  distribution 
of,  in  the  solar  system,  282 ;  on  the 
absolute   measure  of  surface-con- 
ductivity for,  392 ;  on  the  source  of 
the  solar,  476 ;  on  the  reflection  of, 
at  the  surface  of  polished  bodies, 
544. 
Heavenlv  bodies,  on  the  magnetic  re- 
lations of  the,  345,  446,  481. 
Hornstein  (Prof.)  on  aperiodic  change 
of  the  elements  of  the  force  of  ter- 
restrial magnetism,  151. 
Huggins  (Dr.  W.)  on  the  spectrum  of 
Encke's  comet,  380 ;  on  the  tele- 
scopic appearance  of  Encke's  comet, 
390. 
Hull  (Prof.  E.)  on  a  remarkable  fault 
in    the    New  Red    Sandstone    of 
Whiston,  Cheshire,  239. 
Hydrogen,  on  the  spectrum  of,  at  low 
pressure,  155. 
