CONTENTS OF VOL. VI. FOURTH SERIES. VU 



Page 

 On the Passive State of Nickel and Cobalt, by J. Nickles .... 454 

 Researches on the Electrical Conductibility of Gases at High 



Temperatures, by M. Edmond Becquerel 456 



Corrections in Mr. C. J. Hargreave's communication on the 



Calculus of Operations 457 



Meteorological Observations for October 1853 458 



Table 459 



Index 460 





ERRATUM. 



Page 305, line 6, for object-end read object and. 



