This  is  the  fifteenth  number  of  the  Second
Series  of  this  important  periodical.  The  con-
tents are  as  follows : — A  He  view  of  the  Annual
Report  of  the  U.  S.  Survey :  this  article  has
been  copied  into  the  National  Intelligencer  for
May  17,  and  occupies  three  columns  of  that
paper.  A  paper  on  Philosophical  Induction,
Dy  Samuel  Tyler :  whether  Science  can  pro-
ceed altogether  without  the  aid  of  *^  thinkine^^^
is  at  least  doubtful ;  Mr.  Tyler  seems  to  think
not,  else  he  would  not  have  been  at  the  trouble
to  write  this  article.  An  article  by  Samuel
S.  Haldeman,  an  excellent  and  accurate
naturalist,  on  the  identity  of  two  very  curious
and  doubtless  interesting  animals.  Letter  on
Philosophical  Analogy ;  containing  some  new
views.  A  description  of  two  new  minerals,
by  J.  Lawrence  Smith.  Analysis  of  Meteoric
Iron  that  fell  in  Bohemia,  by  A.  Duflos  and  N.
W.  Fischer.  Explanations  of  various  electrical
phenomena  by  the  undulatory  hypothesis,  by
Professor  Hare,  of  Philadelphia:  Professor
Hare  is  evidently  of  the  same  mind  with  Mr.
Tyler.  Description  of  a  mass  of  Meteoric
Iron,  discovered  near  Murfreesboro,  Tenn.,  by
Professor  G.  Troost :  a  bit  of  information  judi-
cious and  brief.  A  Greek  naturalist  would
have  filled  fifty  pages  with  what  is  here  packed
into  one.  Parallelism  of  the  older  rocky  strata
("  Palaeozoic  formations")  of  North  America
with  those  of  Europe.  On  Halley's  Comet,  by
Professor  Loomis,  of  New  York.  A  mathe-
matical JpftPfr  01^  the  propagation  of  sound,
by  Eli  W.  Blake.  Review  of  Professor  Asa
Gray's  Manual  of  Botany :  a  book  with  which
all  botanical  readers  are  well  acquainted.
