68  PROCEEDINGS  OF  THE  GEOLOGICAL  SOCIETY.  [May  1 893, 
in  the  Trent  basin,  and  several  authors  have  written  on  North  Wales 
and  the  Border  districts.  The  north  has  yielded  few  papers,  but  we 
have  one  of  considerable  importance  on  the  Drifts  of  Elamborough 
Head  by  Mr.  Lamplugh,  and  there  is  a  paper  by  Mr.  Kilroe  on  the 
direction  of  the  ice-flow  in  the  North  of  Ireland.  Lastly,  Mr.  Jamie¬ 
son  has  contributed  some  supplementary  remarks  on  the  Parallel 
Hoads  of  Glen  Hoy. 
In  making  a  division  of  the  subject,  the  South-east  and  South  of 
England  are  naturally  the  first  areas  to  claim  our  attention.  Owing 
to  the  number  of  communications  and  the  varied  character  of  the 
phenomena  described,  the  arrangement  of  this  large  amount  of  matter 
is  by  no  means  an  easy  task.  To  attempt  anything  in  the  nature  of 
a  chronological  classification  would  seem  to  be  like  offering  the  Apple 
of  Discord  at  the  very  outset,  since  few  are  agreed  as  to  the  precise 
value  of  the  words  ‘  post-glacial/  ‘  glacial,’  and  ‘  pre-glacial.’  We 
may  indeed  adopt  a  common-sense  interpretation,  partly  suggested 
by  Prof.  Prestwich,  that  4  post-glacial  ’  means  the  time  during  which 
the  cold  was  diminishing,  4  glacial  ’  the  time  when  it  was  at  its 
height,  and  ‘  pre-glacial  ’  the  time  during  which  the  cold  was 
increasing.  It  must  be  obvious  to  all  that  no  sound  chronological 
arrangement  can  be  based  on  these  divisions,  since  ‘  glacial  ’  con¬ 
ditions  may  easily  have  prevailed  in  some  parts  of  our  island  and 
4  post-glacial  ’  in  others,  more  or  less  contemporaneously. 
The  divisions  then  which  I  propose  to  adopt  are  in  the  main  topo¬ 
graphical,  and  include  the  South-east  of  England,  the  South  of 
England,  Central  Eugland  and  North  Wales,  East  Yorkshire,  and 
the  North  of  England  and  Scotland. 
South-east  of  England. — In  many  parts  of  this  district  the  Chalky 
Boulder-clay  acts  as  a  guide  to  a  certain  extent,  and  we  can  at  least 
say  in  these  cases  whether  a  deposit  is  above  or  below  the  Boulder- 
clay.  With  this  proviso  I  would  draw  attention  to  a  paper  by 
Mr.  Candler  on  the  Lacustrine  Deposits  of  St.  Cross.  This  place  is 
situated  within  the  drainage  of  the  Waveney,  the  beds  lying  in  a 
hollow  of  the  Boulder-clay  towards  the  northern  edge  of  the  plateau 
of  Suffolk.  The  lacustrine  beds  themselves  now  occupy  a  ridge 
between  two  depressions,  the  valleys  having  been  deeply  eroded 
since  the  filling-up  of  the  lake.  The  fauna  and  flora  of  such  a 
deposit  are  interesting  from  the  fact  that  there  can  be  no  doubt 
whatever  of  their  marking  a  period  subsequent  to  the  deposition  of 
the  Boulder-clay  of  East  Anglia,  aDd  though  somewhat  remote  in 
time  from  that  deposit,  a  considerable  amount  of  denudation  has 
