836 
INDEX. 
Book,  612  ;  Kobolds  Der  Bau  des 
.Hxsternsy  stems,  613  ;  Lipps's  Die 
Psychischen  Massmethoden,  613  ; 
Black's  Terrestrial  Magnetism  and 
its  Causes,  614  ;  Mann  and  Twiss's 
Physics,  614;  Witte's  Ueber  den 
gegenwjirtigen  Stand  der  Frage 
nach  einer  niechanischen  Erklar- 
ung  der  elektrisclien  Erschein- 
ungen,  728 ;  Cambridge  Tracts 
in  Mathematics  and  Mathematical 
Physics,  831 ;  Carslaw's  Introduc- 
tion to  the  Infinitesimal  Calculus, 
832  ;  Angus's  Preliminary  Course 
in  Differential  and  Integral  Cal- 
culus, 832  ;  Picard's  CEuvres 
Charles  Hermite,  833  ;  Biermann's 
Vorlesungen  iiber  Mathematische 
Nahermethoden,  833;  Frankland's 
First  Book  of  Euclid's  Elements, 
833  ;  Hudson's  Kutnmer's  Quartic 
Surface,  834 ;  Guillaume's  Notions 
d'Electricite,  834. 
Bragg  (Prof.  W.  H.)  on  the  re- 
combination of  ions  in  air  and 
other  gases,  466  :  on  the  ionization 
of  various  gases  by  the  a  particles 
of  radium,  617 ;  on  the  a  particles 
of  uranium  and  thorium,  754. 
Bronson  (Dr.  H.  L.)  on  the  effect  of 
high  temperatures  on  the  rate  of 
decay  of  the  active  deposit  from 
radium,  143;  on  the  ionization 
produced  by  a  rays,  806. 
Buckingham  (E.)  on  the  plug  experi- 
ment, 678. 
Bumstead  (Prof.  H.  A.)  on  the  heat- 
ing effects  produced  by  Rontgen 
rays  in  different  metals,  292. 
Burbury  (S.  II.)  on  the  H  theorem  and 
the  dynamical  theory  of  gases,  455. 
Burton  (E.  F.)  on  electrically  pre- 
pared colloidal  solutions,  425. 
Campbell  (N.  R.)  on  the  radiation 
from  ordinary  materials,  206. 
Cantrill  (T.  C.)  on  the  igneous  and 
associated  sedimentary  rocks  of 
Llangynog,  614. 
Carbon  dioxide,  on  the  amount  of,  in 
the  atmosphere,  226  ;  on  sparking- 
potentials  in,  535. 
Chartres  (R.)  on  minimum  deviation 
through  a  prism,  609. 
Chattock  (A.  P.)  on  a  non-leaking 
glass  tap,  379,  728. 
Chronograph,  on  an  improved  tvpe 
of,  393. 
Clay-with-flints,  on  the,  423. 
Colloidal  solutions,  on  electrically 
prepared,  425. 
Conductivities,  quantitative  rela- 
tion between  molecular,  416. 
Copper,  on  tensile  overstrain  and 
recovery  of,  380. 
Corpuscles,  on  the  number  of,  in  an 
atom,  769. 
Cupric  oxide,  on  the  electrical  con- 
ductivity of,  521. 
Cymoneter,  on  the  use  of  the,  for 
the  determination  of  resonance- 
curves,  665. 
Davison  (Dr.  C.)  on  the  Doncaster 
de  earthquake  of  April  23,  1905,  190. 
Dielectric  constants  of  non-conduct- 
ing liquids,  on  an  apparatus  for 
determining  the,  73. 
■ strain  along  the  lines  of  force, 
on  the,  607. 
strength  of  air,  on  the,  237. 
Dielectrics,  on  the  shielding  effect  of, 
411. 
Diffraction  theory  of  microscopic 
vision,  on  the,  154  ;  of  short  waves 
by  a  rigid  sphere,  on  the,  193. 
Dispersion,  on  electromagnetic  rota- 
tory, 41. 
Distillation,  on  the  isothermal,  of 
nitrogen  and  oxygen  and  of  argon 
and  oxygen,  640. 
Dyke  (G.  B.)  on  the  use  of  the 
cymometer  for  the  determination 
of  resonance-curves,  665. 
Elastic  properties  of  steel,  on  the 
effect  of  combined  stresses  on  the, 
276. 
solid  bodies,  on  the  collision  of, 
283. 
Elasticity,  on  the  surface,  of  saponine 
solutions,  317. 
Electric  arc,  on  an  experiment  with 
the,  829. 
conductivity  of  flames  contain- 
ing salt  vapours  for  alternating 
currents,  on,  484  ;  of  metallic 
oxides,  on  the,  505. 
currents,  on  the  asymmetrical 
action  of  alternating,  upon  apolar- 
izable  electrode,  329 ;  on  oscilla- 
tion valves  for  rectifying  high- 
frequency,  659. 
■ discharge     between     parallel 
plates,  on  the  field  of  force  in  a, 
729. 
fields,   on   the   comparison  of, 
