175 
VoL  4Q 
u±_ui_ 
AX  tLUZZ  IX  0  OX  THE  CTTLLZS*  KILLS. 
13.  Or*  Ixcetsioks  of  Iebhakf  Gluxiie  ;  the  GUebso  of 
Cunaxiy  Hulls.  :  and  c  i  :\&  Psolucts  resulting  from  the 
Pakhab  Bustos’  or  the  Acid  fcy  ft  c  Basic  Bock,  By  Jonsr  M. 
■Judd.  T.B.S..  M.p.&.S..  Professor  of  Greolosv  in  the  Boval 
■*  y  m/ 
College  of  Science.  London.  Bead  Jannary  Porn.  1893.) 
TPuaeds  IL  1  HI.] 
Costetts.  Page 
i.  Tie  literature  of  bdnaoni  A  i  moons  Roeks  . 175 
1.  Tie  Products  of  tie  Eo-fosion  of  Quartz-feMte  Fragments  by  tie  Basalt 
of  flue  AsehBthfflbeL  Saxony .  177 
5.  Tie  Granites  and  As  biro?  of  tie  Cuilkri  Hills  .  180 
Tie  Position  ani  General  Characters  of  tie  GraAte-A elusions  A  tie 
Gabbro  .  182 
Tne  Aterslius  Which  Ae  Minerals  A  tie  Inclusions  lane  'undergone...  184 
6.  Tie  SplerAile  Growths  developed  A  tie  Inclusions  .  186 
7.  Bearing  of  the  Evidence  anirded  by  these  Inclusions  on  tie  Question  of 
the  Relative  Ares  of  tie  Igneous  Bocks  A  tie  Western  Isles  of  Scot¬ 
land . . . - .  191 
8.  Postscript . 194 
1.  Tee  LizEnnrrBE  or  Lvclusioxs  lx  Fixe  out  Bocks. 
Fuz  striking  resnlts  of  time  (xmtact-metamorphism.  displayed 
by  fragments  of  rock  tv  Aon  lave  lain  for  a  rime  in  the  hath  of  a 
molten  igneous  magma,  have  been  frequently  described  by  geologists 
and  petrographers.  Among  sedimentary  materials  which  have 
been  tins  acted  upon,  vre  may  refer  to  the  more  or  less  per¬ 
fectly  vitrified  products  formed  from  arenaceous  roc-ks  h^rglrwter 
sandjgiein  :  the  greatly  altered  and  highly  crystallized  forms  of 
argillaceous  masses — so  often  mistaken  for  "basalts,  before  the 
pleatitn  ::  the  mier: snipe  t:  their  study —  j  :  ;  '  fer, 
Jdesdschiefer.  i  phthaniie,  lydite,  hydrotaehylyte,5  etc.  of  different 
authors  :  and  the  calcareous  or  dolomitic  rocks,  so  wonderfully  rich 
in  beanrknlly  crystallized  minerals  that  have  resulted  from  the 
action  of  molten  lavas  or  fragments  of  limestone  entangled  in  them. 
Such  extreme  results  of  contact-metamorphism  may  he  studied, 
either  A  the  localities  where  the  operations  have  taken  place,  as  at 
Monzoni  in  the  Tyrol : 1  or  among  the  fragments  thrown  out  from 
volcanic  vents,  as  at  Monte  Sonma  and  the  EifeL 
The  phenomena  displayed,  vrhen  fragments  of  an  igneous  or  other 
crystalline  rock  are  caught  up  and  enveloped  in  a  molten  material 
of  ^different  chemical  composition,  have  received  no  less  attention 
from  petrographers.  Some  of  the  results  of  this  extreme  action 
have  been  regarded  as  so  anomalous  that  they  have  given  rise  to 
much  -discussion.  Mi  thorn  attempting  to  make  an  exhaustive  list 
of  works  on  this  question.  I  may  refer  to  the  following  memoirs  as 
especially  bearing  on  the  point  discussed  in  the  present  paper. 
1  GeoL  Mug.  for  1876.  pp.  211-213. 
