Notices  respecting  JXeic  Books.  187 
electrochemical  theory,  including  one  by  Prof.  T.  AV.  Richards, 
"  The  Relation  of  the  Hypothesis  of  Compressible  Atoms  to 
Electro-Chemistry, "'and  others  on  electrolysis  and  various  practical 
applications  of  electro-chemistry.  The  papers  in  Section  J)  will  be 
of  great  interest  to  engineers  having  to  deal  with  high-voltage 
plants  and  transmission  lines,  as  this  subject  is  very  fully  discussed 
by  many  leading  authorities.  Section  E  is,  perhaps,  not  quite  up 
to  the  standard  of  those  already  noticed,  as  although  it  contains  a 
few  papers  of  real  merit,  there  are  others  which  deal  in  vague 
generalities  without  conveying  any  solid  information.  Vol.  III. 
embraces  Sections  F,  G-,  and  H.  In  Section  F,  the  problem  of 
railway  electrification  naturally  claims  the  first  place,  and  the 
single-phase  system  comes  in  for  a  good  deal  of  discussion.  In 
Section  Gr,  we  have  papers  on  high-speed  telegraphy,  wireless 
telegraphy,  and  modern  telephone  exchanges.  Section  FI  will 
appeal  to  medical  men  :  it  contains  papers  on  the  uses  of  X-rays, 
photo-therapy  and  radio-therapy. 
Although  the  work  as  a  whole  is  well  printed  and  illustrated,  it 
seems  a  pity  that  the  discussions  on  the  various  papers  should 
have  been  put  into  very  small  type,  so  small  as  to  make  it  some- 
what trying  to  the  eyes ;  the  larger  type  used  for  the  papers 
might  have  been  retained  without  unduly  swelling  the  size  of  the 
volumes,  and  it  would  certainly  have  been  less  trying  to  the 
reader. 
Anleitung  zu  wissenscliafiliclien  Beobaclitawjen  aaf  lieisen.  Heraus- 
gegeben  von  Professor  Dr.  G.  yon  Keumayeb.  Dritte  Auflage. 
Lieferungen  1  &  2.     Hannover  :  M.  Jiinecke,  1905. 
The  first  two  parts  of  the  third  edition  of  the  above  work 
contain  articles  on  the  determination  of  latitude  and  longitude 
(by  L.  Ambronn),  on  topographical  survey  work  (by  P.  Vogel), 
and  on  anthropology  and  ethnography  (by  F.  v.  Luschau).  The 
last-named  article  contains  many  useful  suggestions  and  is  very 
explicit  in  its  directions  to  the  would-be  explorer.  The  work  is 
to  be  completed  in  about  12  parts. 
Annuaire  pour  VAn  1906.  Public  par  le  Bureau  des  Longitudes. 
Avec  des  Notices  scientifiques.  Paris  :  Gauthier-Yillats.  Prix  : 
1  fr.  50c.     Pp.  iv  +  712  +  A.lGl  +  B.lS  +  C.8-j-D.41. 
This  wonderful  little  annual  contains,  in  addition  to  the  usual 
astronomical,  physical,  and  physico-chemical  tables,  a  special 
illustrated  article  by  M.  Gr.  Bigourdan,  entitled  "Solar  Eclipse. 
Brief  instructions  regarding  the  observations  which  may  be  made 
during  them."  In  view  of  the  interest  manifested  in  the  recent 
solar  eclipse,  the  article  is  a  timely  and  simple  exposition  of  the 
subject  with  which  it  deals. 
