835     ] 
VOL.  XL 
Actinium,  on^ 
the  y  rays  froin^f 
Air,  on  the  absorpti? 
135  ;  on  the  dielectnc^Sttgngth  of, 
237  ;  on  the  recombination  of  ions 
in,  466. 
Alcoholic  solutions,  on  the  osmotic 
pressures  of,  595. 
Alkali  salt  vapours,  on  the  velocities 
of  the  ions  of,  790. 
Alpha  particles  of  uranium  and 
thorium,  on  the,  754. 
rays,  on  the  absorption  of,  131 ; 
on  some  properties  of  the,  166, 
722  ;  on  the  retardation  of  the 
velocity  of  the,  in  passing-  through 
matter,  553  ;  on  the  ionization  of 
various  gases  by  the,  617  ;  on  the 
magnetic  deflexion  of  the,  627  ;  on 
the,  from  radiothorium,  793 ;  on 
the  ionization  produced  by,  806. 
Alternating  currents,  on  the  asym- 
metrical action  of,  upon  a  polariz- 
able  electrode,  329;  on  the  elec- 
trical conductivity  of  flames  for, 
484  ;  on  oscillation  valves  for 
rectifying  high-frequency,  659. 
Aluminium,  on  the  absorption  of  « 
rays  by,  137  ;  on  tensile  overstrain 
and  recovery  of,  380. 
Aluminium-bronze,  on  tensile  over- 
strain and  recovery  of,  380. 
Analysis,  on  a  practical  method  of 
harmonic,  25. 
Anderson  (Prof.  A.)  on  the  focometry 
of  concave  lenses  and  convex 
mirrors,  789. 
Arc,  on  an  experiment  with  the 
electric,  829. 
Arg-on  and  oxygen,  on  the  isothermal 
distillation  of,  640. 
Atmosphere,  on  the  chemical  and 
geological  history  of  the,  226. 
Atom,  on  the  constitution  of  the, 
117,  292,  604;  on  change  in  the, 
292 ;  on  the  number  of  corpuscles 
in  an,  769. 
Barlda  (Dr.  C.  G.)  on  secondary 
Rontgen  radiation,  812. 
Barlow  (P.  S.)  on  the  osmotic 
pressures  of  alcoholic  solutions,  595. 
Bars,  on  the  lateral  vibration  of 
loaded  and  unloaded,  354. 
Barvta,  on  the  electrical  conductivity 
of,  517. 
Becquerel  (Prof.  II.)  on  some  proper- 
ties of  the  a  rays,  722. 
Bismuth  trioxide,  on  the  electrical 
conductivity  of,  519. 
Black  spot  in  thin  liquid  films,  on 
the,  746. 
Blackman  (P.)  on  the  quantitative 
relation  between  molecular  con- 
ductivities, 416. 
Books,  new  : — Transactions  of  the 
International  Electrical  Congress, 
St.  Louis,  186 ;  von  Neuinayer's 
Anleitung  zu  wissenschaftlichen 
Beobachtungen  auf  Reisen,  187  ; 
Annuaire,  Bureau  des  Longitudes, 
187 ;  Chwolson's  Lehrbuch  der 
Physik,  328 ;  Abraham  and  Lange- 
vin's  Ions,  Electrons,  Corpuscles, 
418  ;  Korda's  La  Separation  Elec- 
tromagnetique  et  Electrostatique 
des  Minerals,  41 9 ;  Bouasse's  Essais 
des  Materiaux,  419  ;  von  Gei  tier's 
Elektromagnetische  Sch  wingim  gen 
mid  Wellen,  420  ;  Frick's  Phvsik- 
alische  Technik,  420;  Whetham's 
Theory  of  Experimental  Electricity, 
610  ;  Righi's  La  Theorie  Moderne 
des  Phenomenes  Physiques.  610  ; 
Aschan's  Chemie  der  Alicyklischen 
Verbindungen,  611 ;  Baly's  Spec- 
troscopy, Oil  :  The  Science  Year- 
