RECENT  CHEMICAL  DISCOVERIES. 
In  One  thick  Volume,  8vo,  price  31s.  6d.  cloth, 
SUPPLEMENT  TO  WATTS'S  DICTIONARY  OF  CHEMISTRY; 
Bringing  the  Record  of  Chemical  Discovery  down  to  the  end  of  the  year  186 
including  also  several  Additions  to,  and  Corrections  of,  former  results  which  ha 
appeared  in  1870  and  1871. 
By  HENRY  WATTS,  B.A.,  F.R.S.,  F.C.S., 
Assisted  by  eminent  Scientific  and  Practical  Chemists,  Contributors  to  the 
Original  Work. 
The  ORIGINAL  WORK,  in  Five  Volumes,  8vo,  price  £7  3s. 
London  :  Longmans,  Green,  and  Co.,  Paternoster  Row. 
WILLIAMSON  ON  DIFFERENTIAL  CALCULUS. 
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AN  ELEMENTARY  TREATISE  ON  THE  DIFFERENTIAL 
CALCULUS, 
Containing  the  Theory  of  Plane  Curves,  with  numerous  Examples 
By  BENJAMIN  WILLIAMSON,  M.A., 
Fellow  and  Tutor  of  Trinity  College,  Dublin. 
"Among  the  works  which  have  recently  proceeded  from  the  University  Pre 
under  the  fostering  aid  of  the  Board  of  Trinity  College,  we  are  disposed  to  give' 
high  place  to  the  treatise  on  Calculus,  by  Mr.  Williamson.     We  have  r 
hesitation  m  saying  that,  although  modestly  styled  an  Elementary  Treatise 
gives,  in  every  part  the  author  has  discussed,  a  more  complete  view  of  the  Di- 
fferential Calculus  than  any  English  work  which  has  yet  appeared."— Education*. 
J.  17Y16S  • 
London  :  Longmans,  Green,  and  Co.,  Paternoster  Row. 
DR.  WOOD'S  CHEMICAL  NOTES  FOR  THE  LECTURE-ROOM. 
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NOTES  ON  HEAT,  LAWS  OF  CHEMICAL  COMBINATION,  AND 
CHEMISTRY  OF  THE  NON-METALLIC  ELEMENTS. 
(With  an  Extra  Number  of  Questions.) 
By  THOMAS  WOOD,  Ph.D.,  F.C.S., 
Chemical  Lecturer  at  the  Brighton  and  Lancing  Colleges 
The  SECOND  SERIES-Notes  on  the  METALS.     Second  Edition,  revised 
and  enlarged,  price  5s. 
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SPECTRUM  ANALYSIS 
In  its  Application  to  Terrestrial  Substances  and  the  Physical  Constitution  of  the 
Heavenly  Bodies,  familiarly  explained  by  Dr.  H.  SCHELLEN,  Director  dei 
?f^ ^  Al\2'^?l?^\Jj^}ated  from  the  Second  German  ^ition  b> 
rmQ  "??  £A^°n^NEAA?SELL'  edited'  Wlth  Notes>  by  WILLIAM  HUG- 
IxLlMQ,   LiLi.U.,  D.Kj.L.,  r.K.S. 
"All  who  wish  to  commence  the  study  of  the  spectroscope,  which  is  playing  sa 
prominent  apart  in  science,  should  read  this  volume,  which  gives  a  most  lucid 
and  complete  explanation  of  the  instruments  which  have  been  used  for  the  pur- 
pose, and  of  the  discoveries  made  up  to  the  present  time."— Astronomical  Register. 
London  :  Longmans,  Green,  and  Co.,  Paternoster  Row. 
Just  published,  demy8vo,  price  7s.  6d., 
AN   INDEX   OF   SPECTRA. 
By  W.  MARSHALL  WATTS,  D.Sc. 
With  Eight  Lithographic  Plates  and  a  Chromolithograph.     With  a  Preface  by 
Professor  Roscoe,  F.R.S. 
In  this  work  are  collected0all  the  measurements  of  the  spectral  lines  of  the  ele- 
ments, including  those  by  Angstrom  and  Thalen,  Huggins,  Kirchhoff,  Pliicker. 
&c,  and  these  are  given  upon  a  uniform  scale  of  wave-lengths.     A  drawing  of 
the  spectrum  of  each  element  is  also  given. 
London :  Henry  Gillman,  Boy  Court,  Ludgate  Hill,  E.C. 
lADVERTISEMENTS  continued  on  3rd  page  of  Cover. 
