Railway  Company,  when  a  considerable  amount  of
information  concerning  the  peculiarities  of  the
spectrum  of  the  converter-flame  was  gained,  mainly
by  the  observations  of  Dr.  W.  Marshall  Watts,  a
former  student  and  one  of  his  assistants,  who  took
over  the  subsequent  conduct  of  the  inquiry.
Considering  his  interest  in  the  subject,  compara-
tively little  original  work  on  spectroscopy  was  pub-
lished by  Roscoe.
The  following  is  a  list  of  the  inquiries  with  which
he  was  concerned  :

133


The  Right  Hon.  Sir  Henry  E.   Roscoe

"  On  the  Effect  of  Increased  Temperature  upon  the  Nature  of
the  Light  Emitted  by  the  Vapour  of  Certain  Metals  on  Metallic
Compounds."  By  H.  E,  Roscoe  and  R.  B.  Clifton.  Manchester
Phil.  Soc.  Proc.  II.  (1860-1862),  pp.  227-230.
"  Note  on  the  Absorption-spectra  of  Potassium  and  Sodium  at
Low  Temperatures."  By  H.  E.  Roscoe  and  A.  Schuster.  Roy.
Soc.  Proc.  XXII.  (1874),  pp.  362-364.
"On  the  Absorption-spectra  of  Bromine  and  Iodine  Mono-
chloride."  By  H.  E.  Roscoe  and  T.  E.  Thorpe.  Phii.  Trans.
CLXVII.  (1878),  pp.  207-212.
"  Note  on  the  Identity  of  the  Spectra  Obtained  from  the  Different
Allotropic  Forms  of  Carbon."  By  H.  E.  Roscoe  and  A.  Schuster.
Manchester  Lit.  Phii.  Soc.  Proc.  XIX.  (1880),  pp.  46-49.
"The  Spectrum  of  Terbium."  By  H.  E.  Roscoe  and  A.  Schuster.
Chem.  Soc. /our.  XLI.  (1882),  pp.  283-287.
The  only  attempt  he  was  able  to  make  to  con-
tribute to  our  knowledge  of  the  chemistry  of  the
sun  by  spectroscopic  observations  had  an  unlucky
ending.  He  formed  one  of  the  members  of  the
Government  expedition  sent  to  Sicily  to  observe
the  total  solar  eclipse  of  December  22,  1870.  The
following  letters  refer  to  this  subject :

Victoria  Park,  Manchester,

November  2,  1870.
