(2)  On  the  Laws  of  the  Phenomena  of  the  larger  Disturbances  of  the
Magnetic  Declination  in  the  Kew  Observatory :  with  notices  of  the  progress
of  our  knowledge  regarding  the  Magnetic  Storms.— Proceedings  of  the
Royal  Society*  vol.  x.  p.  624.
(3)  On  the  Lunar-diurnal  Variation  of  the  Magnetic  Declination  obtained
from  the  Kew  Photograms  in  the  years  1858,  1859)  and  1860.^ — Proceedings
of  the  Royal  Society,  vol.  xi.  p.  7S.
The  Superintendent,  Mr.  Stewart,  has  also  communicated  to  the  Royal
Sodetj  m  description  of  the  great  magnetic  storm  at  the  end  of  August  and
beginning  of  September  1859,  deduced  from  tlie  Kew  Photographs.
Mr.  ChambeiB  continues  to  be  zealously  employed  in  the  magnetical  de-
]»Ttment,  and  attends  to  the  self-recording  magnetographs,  which  have  been
maintained  in  constant  operation.
The  nsnal  monthly  absolute  determinations  of  the  magnetic  elements  con-
tiaoe  to  be  made ;  and  the  dip  observations  from  November  1857  to  the
present  date  (282  in  all),  a  large  portion  of  which  were  made  by  the  late
Mr.  Welsh  and  Mr.  Chambers,  have  been  made  available  by  General  Sabin^.
io  conBeifion  with  some  previous  observations  of  his  own  for  determining
the  secular  change  in  the  magnetic  dip  in  London,  between  the  years  1821
and  1860.  See  Proceedings  of  the  Royal  Society,  vol.  xi.  p.  144.
The  instruments  for  the  Dutch  Government  alluded  to  in  the  last  Report
have  been  verified  at  Kew  and  taken  away.  They  consisted  of  a  set  of  self-
reeoftling  magnetographs  with  a  tabulating  instrument,  two  Dip  Circles,  and
one  Fox's  Dip  Circle  for  Dr.  Bergsma ;  also  of  two  Unifilars,  one  for  Dr.
Bergsma  and  one  for  Dr.  Buys  Ballot.
