INDEX. 
.51 
Rotation,  on  a  new  method  of  mea- 
suring the  velocity  of,  398. 
Royal  Society,  proceedings  of  the,  54, 
151,227,310,380,472,529. 
Saturn,  on  the  mean  motion  of,  320. 
Schwendler  (L.)  on  the  best  resist- 
ance of  the  coils  of  any  differential 
galvanometer,  480. 
Seabroke  (G.  M.)  on  the  spectrum  of 
hydrogen  at  low  pressure,  155. 
Selenium,  on  the  absorption-spectrum 
of  the  vapour  of,  4/3. 
Sharpe  (S.)  on  the  moon  seen  by  the 
naked  eve,  427. 
Silver,  on  the  fluoride  of,  382. 
Singing-flame,  on   a  new   sensitive, 
Solar  heat,  on  the  source  of  the,  476. 
physics,  recent  researches  in, 
385. 
Solaro  (Rev.  P.  S.)  on  the  action  of 
nuclei  in  separating  gas  or  vapour 
from  their  supersaturated  solutions, 
205. 
Sound,  on  the  determination  of  the 
velocity  of,  153. 
Spectral  lines,  on  the  displacement  of 
the,  by  the  action  of  the  tempera  - 
perature  of  the  prism,  239. 
Spectroscope,  on  a  new  reversion-, 
47  ;  on  coloured  gelatine  plates  as 
objects  for  the,  240. 
Squares,  on  Laplace's  proof  of  the 
method  of  least,  194. 
Stewart  (Prof.  B.)  on  some  recent  re- 
searches in  solar  physics,  and  on  a 
law  regulating  the  time  of  duration 
of  the  sun-spot  period,  385. 
Stone  (J.  E.)  on  the  determination  of 
the  velocity  of  light,  153. 
Stringed  instruments,  on  the  mode  in 
which  they  give  rise  to  sonorous  un- 
dulations, 439. 
Strutt  (Hon.  J.  W.)  on  the  reflection 
and  refraction  of  light  by  intensely 
opaque  matter,  321. 
Sua,  on  the  spectroscopic  observa- 
tion of  the  rotation  of  the,  47  J  on 
an  explosion  on  the,  76 ;  on  the 
heat-spectrum  of  the,  282. 
Sun-spot  period,  on  a  law  regulating 
the  time  of  duration  of  the,  385. 
Szily  (C.)  on  Hamilton's  principle, 
and  the  second  proposition  of  the 
mechanical  theory  of  heat,  339. 
Tait  (Prof.  P.  G.)  on  the  dissipation 
of  energy,  338,  443;  on  the  his- 
tory of  the  second  law  of  thermo- 
dynamics, 516. 
Telegraph-wires,  on  testing  the  metal- 
resistance  of,  186. 
Tellurium,  onthe  absorption-spectrum 
of  the  vapour  of,  4/3. 
Thermodynamics,  on  the  history  of 
the  second  law  of,  516. 
Thermo-electric  battery,  on  a  liquid, 
71. 
Thermomagnetism,  researches  on, 
144. 
Thomson  (Prof.  J.)  on  the  abrupt 
change  at  boiling  or  condensing  in 
reference  to  the  continuity  of  the 
fluid  state  of  matter,  227- 
Tides,  on  the  theory  of  the,  20 ;  on 
the  mathematical  theory  of  atmo- 
spheric, 24. 
Tomlinson  (C.)  on  the  action  of  nuclei 
in  separating  gas  or  vapour  from 
its  supersaturated  solution,  205. 
Uranus,  on  the  mean  motion  of,  320. 
Van  der  Mensbrugghe  (G.)  on  a  re- 
markable fact  observed  on  the  con- 
tact of  certain  liquids  of  different 
superficial  tensions,  399. 
Vapour-vesicles,  experiments  in  re- 
ference to  the  -  question  as  to, 
316. 
Vaughan  (D.)  on  the  origin  of  ma- 
laria, 209. 
Villari  (Prof.  E.)  on  the  disengage- 
ment of  heat  when  caoutchouc  is 
stretched,  157. 
Vision,  on  recurrent,  343. 
Wanklyn  (J.  A.)  on  water-analysis 
and  water,  525. 
Water-analysis  and  water,  on,  525. 
Weber  (Prof.  W.)  on  electrodynamic 
measurements,  1,  119. 
Whitehouse  (W.)  on  a  new  hygro- 
meter, 538. 
Wilde  (H.)  on  the  influence  of  gas- 
and  water-pipes  in  determining  the 
direction  of  a  discharge  of  lightning, 
115. 
Willson  (R.  W.)  on  the  demagnetiza- 
tion of  electromagnets,  475. 
Wind,  on  a  new  anemometer  for  in- 
dicating and  registering  the  force 
and  direction  of  the,  32. 
Winter  (G.  K.)  on  testing  the  metal- 
resistance  of  telegraph-wires  or 
cables  influenced  by  earth-currents, 
