The  large  work  on  <The  Story  of  the
Heavens, >  revised  to  represent  recent
progress,  brings  within  a  single  volume
all  the  principal  facts  of  the  magnificent
story  of  the  sun  and  moon,  the  solar
system,  the  laws  which  rule  it,  the  plan-
ets of  our  system,  their  satellites,  the
minor  planets,  comets,  and  shooting
stars;  and  the  vast  depths  of  the  uni-
verse filled  with  suns  which  we  see  as
stars.  The  special  questions  of  the  star-
land  known  by  the  telescope  and  the
spectroscope  are  all  carefully  treated.
Dr.  Ball  mentions  Professor  Newcomb's

<  Popular  Astronomy,  >  and  Professor
Young's  volume  on  <The  Snn,>  as  works
from  which  he  has  derived  valuable  as-
sistance, and  which  readers  may  include
in  a  complete  astronomical  library.  Two
small  works  by  Dr.  Ball,  not  mentioned
above,  are  ^The  Cause  of  an  Ice  Age,>
discussing  the  possible  astronomical  ex-
planations of  the  ages  of  excessive  cold
in  the  immensely  remote  past  of  the
earth;  and  <Time  and  Tide,>  a  couple  of
lectures  on  the  very  beginnings  by  which
the  globe  came  into  the  shape  and  place
through  which  it  oould  become  the  earth
as  we  know  it.
