HiH.  ii.  i.  Agric  20  ;  comp.  QuintiL  I.  O.  riL  3.
§  5).  Under  ordinary  circumttancea,  howeTer,  the
taili  wai  devolved  upon  one  of  the  military  tribune),
and  a  certain  number  of  ccDturioni  appointed  from
time  to  time  for  the  purpoae.  Thete  having  gone
forward  in  advance  at  the  army  until  they  reached
the  place  near  which  it  wat  intended  to  halt,  and
having  lafcen  a  general  lurvey  of  the  groand,  le-
lected  a  spat  from  whence  a  good  view  of  the  whole
propoied  area  might  be  obtained,  that  ipot  being
coniidciably  withui  the  limit!  of  Ihc  conlcmplalcd

OomtTvtHoit.  —  The  ipot  aniweiing  theae  con-
diliou  and  which  we  ihall  caU  A  (fig.  1.)  wu
marked  by  a  imoll  white  Bag.  The  Dcit  object
wni  to  aicertain  in  what  directina  water  and  fodder
might  be  rooit  efl»ily  and  Kcnrely  provided  —

joined  figure.  Upon  the  poiitioD  of  A  and  the
direction  cf  the  arrow  depended  the  diqxiaition  of
all  the  other  pnrti  of  the  work  ;  for  theae  two  pro-
liminory  pointe  being  decided,  the  buiineu  of  mea<
■uring  out  the  ground  (nulari  oufra)  commenced.
d  n>di  {defxmjKilae)  by  penoni  de-
nominated mtiatortt.  The  difiercnt  itcjia  of  the
proccM  may  be  moat  briefly  and  diatuictlj  act
down  in  the  oidinary  tongaige  of  *  geometiiall

Through  A  draw  a  atnif^t  line  Ao  A , ,  rarallel
to  the  direclion  of  the  arrow,  a  itiaigfat  liae  Bg  B,
at  right  onglei  to  A„  A,.  Theae  two  atraight
linea  AoAi.and  B,,  B.,  lerred  ai  the  baaea  by
which  the  potition  of  all  the  different  diiiiiona  <rf
the  camp  were  determined.
