po-tns,  po-tio,  a  drinking,  a  drink,  Si potion;  po-tor,  a  drinker,
a  drunkard  ;  po-to,  to  drink  (usually  from  passion,  habit,  etc.),
to  tipple,  (compd.  w.  e,  prae,  per)  ;  po-tatio,  a  drinking,  a  pota-
tion; po-culum,  a  drinking-vessel,  cup,  bowl;  bl-bo,  to  drink
(from  natural  thirst),  (compd.  w.  com,  e,  in,  per,  prae),  [im-
bibe] ;  bi-bu-lus,  drinking  readily,  bibulous ;  im-bu-o  (a  sort  of
causative  to  imbibo),  to  cause  to  drink  in,  to  fill,  to  imbue,

309.  TToi-ixrjv^  a  shepherd.  This  word  is  to  be  traced  to  the
root  pa^  meaning  protect.
310.  Pii  5   P^  5  •n'O''  5   Pw  5   cleanse,  purify.
TTot-i/T/,  a  penalty ;  d-iroL-va  (pi.),  a  ransom,  recompense,
penalty.
pti-tus,  purified,  pure ;  pii-to,  (lit.  to  clean,  cleanse,  trim,
prune,  [in  this  lit.  sense  very  rare]),  (very  freq.  in  the  trop.
sense)  to  make  clear,  set  in  order,  reckon,  compute,  consider ;
am-pu-to,  to  cut  around,  to  cut  off,  [amputate] ;  com-pil-to,  to
reckon,  compute ;  de-pu-to,  to  prune,  consider,  (in  late  Latin)
to  destine,  allot,  [depute,  deputy,  deputation] ;  dis-pii-to,  to  cal-
culate, consider  well,  discuss,  dispute;  ex-pu-to,  to  prune,  con-
sider well,  comprehend ;  inter-pu-to,  to  prune  out  here  and
there ;  re-pii-to,  to  count  over,  compute,  reflect  upon,  [repute,
reputation,  reputable]  ;    pu-tamen,  prunings,    waste  ;    ptl-tator,


118  EEGULAE,   SUBSTITUTION   OF   SOUNDS.
