The  enormity  of  their  task  of  digesting  and  cataloguing  the  biological  litera-
ture of  each  year  appears  to  have  dawned  forcibly  upon  the  editors  of  the  Annee
Biologique,  and  they  have  in  the  present  volume  compressed  the  labors  of  nearly
two  years,  bringing  the  work  in  all  essential  respects  down  to  the  close  of  the  year
1900.     They  have  been  obliged,  however,  to  defer  the  publication  of  the  botanical
portion  until  the  coming  year.     Thanks  to  a  more  rigorous  control  of  the  reviews
and  analytical  summaries,  and  to  the  strict  elimination  of  what  does  not  directly
concern  biology,  the  present  volume,  although  covering  two  years,  is  not  larger  nor
more  expensive  than  its  predecessors.     The  editor  hopes  in  this  way  to  publish
future  volumes  promptly,  with  less  expenditure  of  labor  and  space,  and  to  fulfil
precisely  the  same  purposes.     The  reader  will  find  in  this  book,  which  is  indis-
pensable to  workers  in  biology  and  to  all  who  have  occasion  in  other  sciences  to
consult  biological  literature,  all  the  references  and  bibliographical  information  t^at
he  is  ever  likely  to  need.  /t.
JUST  PUBUSHEDl

The   Science  of    Mechanics

A  Critical  and  Historical  Account  of  Its  Development


THE  SCIENCE  OF  MECHANICS.  A  Critical  and  Historical  Account
of  Its  Development.  By  Dr,  Ernst  Ma€h»  Professor  of  the  History
and  Theory  of  Inductive  Science  in  the  University  of  Vienna*  Trans-
lated by  Tboma^  J,  McCormack,  Second  Enlarged  Edition.  259  Cuts.
Pages,  XX,  605*  Cloth,  Gilt  Top,  Marginal  Analyses.  Exhaustive
Index.     Price,  $2,00  net  (9s.  6d.  net).
