IV  CONTENTS  OF  VOL.  XI. SIXTH  SERIES. 
Page 
Mr.  T.  F.  Jamieson  on  the  Glacial  Period  in  Aberdeen- 
shire and  the  Southern  Border  of  the  Moray  Firth    .  .    189 
Dr.  J.  W.  Evans  on  the  Eocks  of  the  Cataracts  of  the 
River  Madeira  and  the  adjoining  portions  of  the  Beni 
and  Mamore 190 
Dr.  C.  Davison  on  the  Doncaster  Earthquake  of  April 
23rd,  1905 190 
Prof.  E.  Hull  on  the  Physical  History  of  the  Great 
Pleistocene  Lake  of  Portugal   191 
Mr.  A.  Harker  on  the  Geological  Structure  of  the  Sgurr 
of  Eigg 192 
NUMBEE  LKIL— EEBEUAEY. 
Mr.  J.  W.  Nicholson  on  the  Diffraction  of  Short  Waves  bv 
a  Eigid  Sphere "    193 
Mr.  N".  E.  Campbell  on  the  Eadiation  from  Ordinary  Materials. 
(Plate  V.) 206 
Mr.  J.  Stevenson  on  the  Chemical  and  Geological  History  of 
the  Atmosphere     226 
Mr.  A.  Kussell  on  the  Dielectric  Strength  of  Air 237 
Mr.  E.  L.  Hancock  :   Preliminary  Eeport  on  the  Effect  of 
Combined    Stresses    on   the    Elastic   Properties    of   Steel. 
(Plate  VI.) 276 
Lord  Eayleigh  on  the  Production  of  Vibrations  by  Forces  of 
Relatively  Long  Duration,  with  Application  to  the  Theory 
of  Collisions   283 
Lord    Eayleigh  :    Note   to    "  Electrical   Vibrations    and   the 
Constitution  of  the  Atom  '" 292 
Prof.  H.  A.  Bum  stead  on  the  Heating  Effects  produced  by 
Eontgen  Eays   in  different  Metals,  and  their  Eelation  to 
the  Question  of  Change  in  the  Atom 292 
Mr.   S.   A.   Shorter  on  the  Surface  Elasticity  of  Saponine 
Solutions    317 
Notices  respecting  New  Books  : — 
Prof.  0.  D.  Chwolsori's  Lehrbuch  der  Physik    328 
NUMBEE  LXIIL— MAECH. 
Dr.  P.  G.  Gundry  on  the  Asymmetrical  Action  of  an 
Alternating  Current  on  a  Polarizable  Electrode     329 
Mr.  J.  Morrow  on  the  Lateral  Vibration  of  Loaded  and 
Unloaded  Bars 354 
Mr.  E.  E.  Gwyther  on  the  Eange  of  Scokes's  Deep- Water 
Waves 374 
