CONTENTS  OF  VOL.  XI. SIXTH   SERIES.  V 
Page 
Mr.  A.  P.  Chattock  on  a  Non-leaking  Glass  Tap 379 
Prof.  A.  Morley  and  Mr.  G.  A.  Tomlinson  on  Tensile  Over- 
strain and  Recoverv  of  Aluminium,  Copper,  and  Aluminium- 
Bronze.    (Plate  VII.) 380 
Mr.  R.  L.  Mond    and    Dr.  Meyer   Wilderman    on   a   New 
Improved  Type  of  Chronograph.     (Plate  VIII.)    393 
Mr.  D.  Owen  on  the  Comparison  of  Electric  Fields  by  means 
of  an  Oscillating  Electric  Needle     402 
Mr.  IT.  Morris-Airey  on  the  Eesolving  Power  of  Spectro- 
scopes        414 
Mr.    P.    Blackman   on    the    Quantitative    Relation   between 
Molecular  Conductivities 416 
Notices  respecting  New  Books  : — 
Messrs.  H.  Abraham  &  P.  Langevin's  Ions,  Electrons, 
Corpuscules    418 
D.  Korda's  La  Separation  Electromagnetique  et  Electro- 
statique  des  Mineral's    419 
Prof.  H.  Bouasse's  Essais  des  Materiaux 419 
Prof.   Dr.  J.   Hitter  von    Geitler's    Elektromagnetische 
Schwingungen  und  Wellen 420 
Dr.  J.  Frick's  Physikalische  Tecknik   ........ 420 
Proceedings  of  the  Geological  Society  : — 
Miss  G.  L.  Elles  and  Miss  I.  L.  Slater  on  the  Highest 
Silurian  Rocks  of  the  Ludlow  District    421 
Mr.  C.  A.  Matley  on  the  Carboniferous  Rocks  at  Rush 
(County  Dublin)   ,  1 .    422 
Mr.  A.  J.  Jukes-Browne  on  the  Clay-with-Flints  :    its 
Origin  and  Distribution    423 
NUMBER  LXIV.— APRIL. 
Mr.  E.  F.  Burton  on  the  Properties  of  Electrically  Prepared 
Colloidal  Solutions    425 
Mr.  A.  O.  Rankiue  on  the  Decay  of  Torsional  Stress  in 
Solutions  of  Gelatine    447 
Mr.  S.  H.  Burbury  on  the  II  Theorem  and  Professor  J.  H. 
Jeans's  Dynamical  Theory  of  Gases    455 
Prof.  W.  II.  Bragg  and  Mr.  11.  D.  Kleeman  on  the  Recom- 
bination of  Ions  in  Air  and  other  Gases 466 
Prof.  H.  A.  Wilson  and  Mr.  E.  Gold  on  the  Electrical  Con- 
ductivity of  Flames  containing  Salt  Vapours  tor  Rapidly 
Alternating  Currents     484 
Dr.  F.  Horton  on  the  Electrical  Conductivity  of  Metallic 
Oxides    
Mr.  J.  Walker  on  Talbot's  Lines     
Mr.  II.  E.  Hurst  :  Genesis  of  Ions  by  Collision  and  Sparking- 
Potentials  in  Carbon  dioxida  and  Nitrogen     
